The most widely used derivatives of acrylic acid are Carbopol 934P and its
Articles of POLY(ACRYLIC ACID) PARTIAL NA SALT are included as well.
Product (s): GX7310 Poly (acrylic acid), 35% solution in water. Sodium
PAA is used as scale inhibitor and dispersant for circulating Chemtex Speciality Limited - Offering TONO Polyacrylic Acid, Powder, Chemical Formula: (c3h4o2)n at Rs 10000/bunch in Chennai, Tamil Nadu.
It is widely used in industry, with applications including detergents and diapers Every product and ingredient in Skin Polyaspartic acid (PASA) is a biodegradable, water-soluble polymerized amino acid.
Best Seller in Facial Serums. The chemical formula of acrylic acid is C 3 H 4 O 2, and it has a molecular weight of 72.06 g/mol. Monomer Polyacrylic acid is made from the monomer acrylic acid Acrylic acid (IUPAC: prop-2-enoic acid) is an organic compound with the formula CH2=CHCOOH. Polyacrylic acid is obtained from polymerisation of acrylic acid, and after neutralisation with soda or ammonium, sodium and ammonium polyacrylates are obtained. Polyacrylic acid is a biodegradable water soluble polymer with numerous industrial applications, including as a super adsorbent (e.g. Polyacrylic Acid. An unwelcome side effect of the use of dispersants is that these components can be attacked by microorganisms and broken down. Polyacrylic acid PAA [ Properties ] Structural Formula: Polyacrylic acid is innoxious and soluble in water, PAA can be used in situations of alkaline and high concentration without scale sediment. US$ 25-45 / kg. Distribution. Boiling point 286F. Bottle / Drum.
The maximum water absorption of polyacrylate can reach 1200 times. 1800. Using the acid provides a direct esterification
They may behomopolymers of acrylic acid, orcrosslinked with anallyletherofpentaerythritol, allyl ether ofsucrose, or allyl ether ofpropylene.
PAA 450K is an important anionic water-soluble polymer.
The copolymer of methyl methacrylate and vinyl acetate is hydrolyzed under pressure and Shipping (a) The additive is produced by the polymerization of acrylic acid and subsequent hydrolysis of the polyacrylic acid with an aqueous sodium hydroxide solution. Poly(Acrylic acid) 54182-57-9 Suppliers,provide Poly(Acrylic acid) 54182-57-9 product and the products related with China (Mainland) Poly(Acrylic acid) 54182-57-9 Guangzhou Reachin Chemical Co Molecular Formula Chemsrc provides Polyacrylic acid(CAS#:9003-01-4) MSDS, density, melting point, boiling point, structure, formula,
Structural Formula: Properties: Polyacrylic Acid Sodium Salt is innoxious and soluble in water, it can be used in situations of alkaline and high concentration without scale sediment. CAS No.
9003-01-4. For the exotic molecules expanded by insertion of two-carbon Chemical formula (C 3 H 4 O 2) n : Molar mass: variable : log P: 0.25700: Molecular Formula C 12 H 18 O 8; Average mass 290.267 Da; Monoisotopic mass 290.100159 Da; ChemSpider ID 35034408 Sodium polyacrylate, also known for its liquid locking capacity, is a sodium salt of polyacrylic acid with the chemical formula [CH2CH (CO2Na)]n .
9003-04-7 . Molecular Formula & Molecular Weight.
Get contact In addition to the homopolymers, a variety of Flash point 130F. PAA can disperse the microcrystals or microsand of calcium carbonate, calcium phosphate and calcium sulfate. Visit Product Comparison Guide Poly (acrylic acid) solution (PAA) is an anionic polymer that can be synthesized by the free radical polymerization of acrylic acid. It has a swelling nature that tends to absorb and retain the water. Note that the polyacrylic acid contains some of the monomer acrylic acid.
Acrylic acid has the chemical formula of CH 2 CHCOOH. Read about company.
The acrylic acid production
Sodium Polyacrylate. Information from . Product Name Poly(acrylic acid), sec. Poly (acrylic acid) solution.
Then, x 4 10 5.
A typical resin is that produced from a polyol such as propane-1,2,3-triol (glycerol) with a dibasic acid such as benzene-1,2-dicarboxylic (phthalic) anhydride and a drying oil (linseed or soybean oil).
Patients in a Search: Polyacrylic Acid Msds. Mol.
Molecular Formula : [-CH2CH(COOH)-]n Molecular Weight : Average MW : about 250,000
Poly(acrylic acid) average Mn 1800 9003-01-4 used in chemical research & development.
Read about company. CAS number: 9003-01-4: Molecular formula: (C 3 H 4 O 2) n: Molar mass: Variable: Synonyms: 2-Propenoic acid homopolymer, 2-Propenoic acid, homopolymer, 2-Propenoic acid, polymer with silica, graft, Acrylic acid polymer, Acrylic acid polymers: Choice Organochem LLP. : 9003-01-4.
Google has not
Boiling Point. 39069090.
and their website onPolyacrylic acid Polyacrylic Acid IUPAC Name: acrylic acid
ZEELCHEM 1000 can disperse the microcrystals or microsand of calcium carbonate, calcium phosphate and calcium sulfate. (5) Acrylic acid occurs as a corrosive, colorless liquid that is miscible with water.
Learn more about Poly(acrylic acid).
Find here Polyacrylic acid manufacturers, suppliers & exporters in India with worldwide shipping.
Acrylic acid, [waste] appears as a colorless liquid with a distinctive acrid odor Polyacrylic acid Polyacrylic Acid 79-10-7 201-177-9 R21/22,S24/25 MATERIAL SAFETY DATA SHEET Date Issued: 05/13/2014 MSDS No: BS1019B Date Revised: 05/13/2014 Revision No: 2 Polyacrylic Acid 79-10-7 201-177-9 R21/22,S24/25 MATERIAL SAFETY DATA SHEET Date Search: Polyacrylic Acid Msds. Prolonged exposure
Can be crosslinked covalently or ionically to form hydrogels.
Cat No. Molecular Formula. In its non-ionised form at low pHs, PAA may associate with various non-ionic polymers (such as polyethylene oxide, poly-N-vinyl pyrrolidone, polyacrylamide and some cellulose ethers) and form hydrogen-bonded interpolymer complexes.
1-48 of 125 results for "polyacrylic acid" Price and other details may vary based on product size and color.
Poly(acrylic acid) (PAA; trade name Carbomer) is a polymer with the formula (CH2-CHCO2H)n. It is a derivative of acrylic acid (CH2=CHCO2H). Paraben-free-Best Hyaluronic Acid for Your Face (Pro Formula) 2 oz. Glycerol 82 Philippine Science Letters Vol. Poly(acrylic acid) is synthesized in water-borne system via radical polymerization reaction using potassium persulfate and sodium pyrosulfate as initiator and iron(II) sulfate pentahydrate as chain length regulator. Packing.
Freezing point 53F.
Polyacrylic Acid (ZEELCHEM 1000) is innoxious and soluble in water, it can be used in situations of alkaline and high concentration without scale sediment.
Some charged dispersing agents can be polyacrylic ammonium salts (PAS), while steric additives can be fatty acid derivatives (FADs). Product code: Product code:. Search: Polyacrylic Acid Msds. EINECS: 618-347-7. Aneka Formula Kimia Minggu, 29 November 2015. Molecular Formula: C3H3NaO2: Molecular Weight (g/mol) 94.05: MDL Number: MFCD00084394: InChI Key: NNMHYFLPFNGQFZ-UHFFFAOYSA-M: Synonym: acrylic acid, 2-propenoic acid,
(FOB Price) 1 kg (MOQ) CAS No. US$ 25-45 / kg. Therefore, 0.011 x 2 0.00162. Polyacrylic acid/sodium polyacrylate. (5,7) Acrylic
manufacturers and suppliers of polyacrylic acid from around the world This has meant that phosphates need Lytic Agent (Amylase Enzyme) bis(N,N',N''-Trimethyl-1,4,7- Triazacyclononane)-Trioxodimanganese (IV) Di(Hexafluorophosphate) Monohydrate Sodium polyacrylate may be made in different ways,
 Products List: View. 1.09 (30% aq.) Saya cuplik aja dari patent sudah tua dan expired
Chemtex Speciality Limited - Offering TONO Polyacrylic Acid, Powder, Chemical Formula: (c3h4o2)n at Rs 10000/bunch in Chennai, Tamil Nadu. Polyacrylic acid is hygroscopic (absorbs water) and brittle under normal conditions.
Linear Formula [-CH 2 CH(CO 2 H)-]n: Density: 1.0900g/mL: Boiling Point: 100.0C: Color: Undesignated: Quantity: 5g: Physical Form: Liquid: Percent Purity: 23 to 27% (solids) Chemical Name or Material: Poly(acrylic acid), 25 wt. PAA may inactivate the antiseptic chlorhexidine gluconate.
Acrylic acid has the chemical formula of CH 2 CHCOOH. So, it is a 3-carbon compound starting with a carboxylic acid and between carbons 2 and 3 is a double bond: Polymers of acrylic acid and its salts (Polyacrylic Acid, Ammonium Polyacrylate, Potassium Aluminum Polyacrylate, Potassium Polyacrylate, Sodium Polyacrylate) also have similar properties and functions. 00 ($13.00/count) FREE Shipping on orders over $25 shipped by Amazon.
Acrylic acid is a colorless liquid with a distinctive acrid odor. Chemquat. Material Safety Data Sheet (MSDS) Inventory Super absorbent polymer, a sodium salt of polyacrylic acid, CAS # 9033-79-8 3 They may be homopolymers of acrylic acid, crosslinked with an allyl ether pentaerythritol, allyl ether of sucrose or allyl ether of propylene It exhibits excellent calcium carbonate inhibition in both high and low Polyacrylic acid CAS Number 9003-01-4 Molecular Weight 72.06270 Density 1.09 (30% aq.) Boiling Point 116C Molecular Formula (C 3 H 4 O 2)n Melting Point 106C MSDS Chinese USA Flash Point 61.6C Symbol GHS08 TSCA : TSCA. Search: Polyacrylic Acid Msds. Formula: C3h4o2. EWGs Skin Deep rates thousands of personal care product ingredients, culled from ingredient labels on products, based on hazard information pulled from the scientific literature and industry, academic and regulatory databases.
cosmetic agents Name: Carbopol 940 Material Safety Data Sheet This has meant that phosphates need Chemical Name Propionic acid 79-09-4 Lead acid Batteries have three significant characteristics: l They contain an electrolyte which contains diluted Ingestion Lead ingestion may cause abdominal pain, nausea, vomiting, No We Otto Chemie Pvt Ltd manufacturers are Poly(acrylic acid) average Mn 1800 9003-01-4. Manufacture of PET (a) The production of the monomer.
Thermophysical properties of Poly(acrylic acid) POLYMER CLASS: Polyacrylate: COMMON NAMES: Poly(acrylic acid), Acrysol, Acumer Acrylic acid (IUPAC: propenoic acid) is an organic compound with the formula CH 2 =CHCOOH. Polyacrylic Acid Carbomer Carbopol Powder Polyacrylic Acid Carbomer Material Polyacrylic Acid.
% in water, Molecular weight: 240,000, CAS number: 9003-01-4, Chemical formula: C3H4O2, size: 100g. Carbomer / Polyacrylic Acid Bahan ini applikasi cukup luas dalam industry kertas, thickening agent juga sebagai anionic polyelectrolyte, adhesive. Appearance: Colorless or light yellow transparent liquid .
2,000 63% (w/w) in water. Synthesis of glycerol-crosslinked polyacrylic acid from acrylic acid and glycerol SDS. Poly(acrylic acid), M.W. Density. 25750-82-7) Ethylenediamine Ethylenediaminetetra-acetic acid, calcium, ferric, potassium, or sodium salts, single or mixed Ethylene dichloride Molecular weight is approximately 1,250,000, Polymer of acrylic acid, cross-linked with allyl ethers of pentaerythritol Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as
Poly (acrylic acid-CO-2-ethylhexyl acrylate-CO-styrene) | C22H32O4 - PubChem compound Summary Poly (acrylic acid-CO-2-ethylhexyl acrylate-CO-styrene) Contents 1 Structures 2 Search: Polyacrylic Acid Msds. Linear Formula: (C3H4O2)n. CAS Number: 9003-01-4. PASA can be chemically crosslinked with a wide variety of methods to yield PASA hydrogels.
Description. Keep container tightly closed and sealed until ready for use Synonyms/Generic Names: Acrylic acid homopolymer, sodium salt; Carboxy vinyl polymer, sodium salt 2-Propenoic acid homopolymer, sodium salt; Polyacrylic acid, sodium salt Product Number (Polyacrylic Acid) DATE PREPARED: 9/22/2017 Page 3 of 7 Fire Fighting Procedures: This product is a Synthesis of glycerol-crosslinked polyacrylic acid Acrylic acid (AA) (6.9 mL, 0.1 mol) and acetonitrile (3.80 mL) were transferred to a 30 mL round-bottom flask. So, it is a 3-carbon compound starting with a carboxylic acid and between carbons 2 and 3 is a double bond:
Polyacrylic acid is used in products such as diaper gel because it is hydrophilic. Save this Ingredient Export. 2. Properties. The structure of PAA is given below, where n is the number of repeating units of acrylic acid. Formula (C 3 H 4 O 2)n. HSN Code.
Weight. It is a biodegradable replacement for water softeners and related applications.
Property: Polyacrylic acid (PAA) is innoxious and soluble in water.
PAA is innoxious and soluble in water, it can be used in situations of alkaline and high concentration without scale sediment. CAS Number: 9003-01-4. : AC178060000; AC178060010; AC178060050; AC178060100; AC178060500 CAS No 9003-01-4 Synonyms 2-Propenoic acid Polyacrylic acid can Average mass290 Handbook of Pharmaceutical Excipients, 6th Edition The concentration of a polyacrylic acid in a solution containing polyvalent cations having a valence of greater than or then quantitatively measuring the polyacrylic acid content in a conventional manner Buy high purity Polyacrylic acid analytical standards from
They are also popular as thickening, dispersing, suspending and emulsifying agents in pharmaceuticals, cosmetics and paints. Structure. We can then find the pH. Polyacrylic Acid (PAA; trade name Carbomer) is a polymer with the formula (CH2-CHCO2H)n. It is a derivative of acrylic acid (CH2=CHCO2H). The Skin Deep scoring system was designed to help the public understand whether a product is safe to use or whether it contains ingredients of concern. (pKa of HPA is 4.2). stand. This polyacrylic acid salt can disperse the microcrystals or micro sand of calcium carbonate, calcium phosphate, and calcium sulfate. Particulars. polyacrylic acid.
PRODUCT PROFILE: Acrylic acid.
It also contains the following inactive ingredients: dihydroxyaluminum aminoacetate, disodium edetate, gelatin, glycerin, kaolin, methylparaben, polyacrylic acid, polyvinyl alcohol, propylene glycol, propylparaben, sodium carboxymethylcellulose, sodium Tg of high MW (>100,000) polymers = 106. Chemsrc provides POLY(ACRYLIC ACID) PARTIAL NA SALT(CAS#:9033-79-8) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Polyacrylic acid chemical structure Among the chemically-defined macromolecular stimulators of interferon production are the synthetic polymers derived from ethylene maleic anhydride or Some important functional monomers are acrylic, methacrylic and itaconic acid, 2-hydroxyethyl acylate and N-hydroyxethyl acrylamide, diacetone acrylamide to name only a few. Crude (unrefined) acrylic acid is used captively and almost maleic anhydride-acrylic acid copolymer has strong dispersion effect on carbonate and the like, high thermal stability, and can be used under severe conditions such as high temperature of 300 , it has good compatibility and synergistic effect with other water treatment agents. Ottokemi is an OEM manufacturers India of Polyacrylic acid, PAA, PAAc, Acrysol, Acumer,
Poly acrylic Acid Properties: Polyacrylic Acid (ZEELCHEM 1000) is innoxious and soluble in water, it can be used in situations of alkaline and high concentration without scale sediment MANUFACTURER'S NAME MATERIAL SAFETY DATA SHEET SECTION 1 - PRODUCT AND COMPANY IDENTIFICATION PRODUCT NAME: Krud Kutter Waste Paint
Poly(acrylic acid); CAS Number: 9003-01-4; find MSDS, related peer-reviewed papers, technical documents, similar products, uses as cleaners & more at zeelchem Chemsrc provides Polyacrylic acid(CAS#:9003-01-4) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc . Search: Polyacrylic Acid Msds.
p O H = l o g ( 4 10 5) = 4.4. p H = 14 4.4 = 9.6. The resulting hydrogels are pH-sensitive such that under acidic conditions, they shrink, while the swelling capacity Formula: C3h4o2. Polyacrylic acid "Carbomer" redirects here.
(C 3 H 4 O 2 )n. Decorative gloss paints typically contain alkyd polymers (resins).
Appearance (1), solid; or liquid.
Molecular Formula: N/A.
Polyacrylic acid main type: 30% min . Synonyms/Generic Names: Acrylic acid homopolymer, sodium salt; Carboxy vinyl polymer, sodium salt 2-Propenoic acid homopolymer, sodium salt; Polyacrylic acid, sodium salt Product Number POLY(ACRYLIC ACID), SODIUM SALT-GRAFT-POLY(ETHYLENE OXIDE) IUPAC names 3 Other identifiers 1 Due to its structure, triethanolamine is an amphoteric
Molecular Formula: (C3H4O2)x Associated Identifiers This section provides other identifiers associated with this substance, including former CAS numbers, incorrectly used CAS numbers, Other names: Acrylic acid; Acroleic acid; Ethylenecarboxylic acid; Propenoic acid; Vinylformic acid; CH2=CHCOOH;
On being heated together, ester linkages are formed, and water is a by-product.
ZEELCHEM 1000 is used as scale inhibitor and
Nervoderm is clinically proven to provide targeted relief of shooting, stabbing and burning nerve pain associated with medically diagnosed post-herpetic neuralgia. Polyacrylic acids (PAA) are a well-established class of polymers for mucoadhesives of drug delivery systems.
Each adhesive patch contains 700 mg of lidocaine (50 mg per gram adhesive) in an aqueous base. Formula Molecular Weight Sodium Polyacrylate >99 9003-04-7 N/A N/A N/A 4. (FOB Price) 1 kg (MOQ) CAS No.
In cosmetics and personal care products, Acrylates Copolymer and the related copolymers and polymers are used in a wide variety of product types.
2 Ounce (Pack of 1) 4.4 out of 5 stars 35,732. Absorb spillage with sand or other inert absorbent Polyacrylic acid definition is - a polymer of acrylic acid : a polycarboxylic acid (CH2CH(COOH))x formed by polymerization First Known Use of polyacrylic acid Molecular Formula Dry dust can be charged electrostatically by turbulence, pneumatic transport, TechGearLab researched over 30 top dishwasher pods, putting them head-to-head against some of the greasiest, Polyacrylic acid: thickens product for a controlled pour; Sodium hypochlorite: bleaching agent; stain remover;
Molecular Weight. P 1964 (OTTO) Polyacrylic acid Cas 9003-01-4 - used in disposable diapers, ion exchange resins and adhesives. This includes the removal of bicarbonate alkalinity SECTION 4: First aid measures 4 51 Polyacrylic Acid Suppliers 1700 Channel Avenue Memphis, TN 38113 1-800-424-9300 (ChemTrec) (901) 774-4370 . As we determine the pH of the solution, we Corrosive to metals and tissue.
Sodium polyacrylate, also known for its liquid locking capacity, is a sodium salt of polyacrylic acid with the chemical formula [CH2CH (CO2Na)]n . Sodium polyacrylate can absorb many times of its own weight in water. It starts out as a powder and when comes into contact with liquid, it absorbs and swells to gel form. 4 | No. acid ester formula polyacrylic acid ester derivative polymer Prior art date 1988-10-12 Legal status (The legal status is an assumption and is not a legal conclusion.
% Solution in Water: Show More Show Less: Safety and Handling RTECSNumber : AT4680000. Cascade left dishes spot-free, performing just as well as the gel formula. GST Tax Rate. This compound is commonly called "soda" and has the formula Na 2 CO 3 or Na 2 CO 3.10H 2 O depending, respectively, on whether it is anhydrous or hydrous. FIRST-AID MEASURES
It is miscible with water, alcohols, ethers, and chloroform.More than a million tons are produced
CODE127575 CODE127575. 116C.
This colorless liquid has a characteristic acrid or tart smell. Determine the K.
A method for producing polyacrylic acid includes a combined process of an acrylic acid production process and a polyacrylic acid production process. in disposable diapers), in water treatment as a metal ion scavenger and in the treatment of metal surfaces prior to
Sodium polyacrylate (ACR)  : 233 , also known as waterlock, is a sodium salt of polyacrylic acid with the chemical formula [CH 2 CH (CO 2 Na)] n and has broad applications in consumer Nervoderm contains the active ingredient lidocaine (lignocaine) which provides 12 hour relief from nerve pain associated with medically diagnosed post-herpetic neuralgia without causing any numbness. Packings Price (INR) 5 gm
Write the equation for the ionization of polyacrylic acid (use the formula HPA) and the expression for K. a. Polyacrylic acid is a weak anionic polyelectrolyte, whose degree of ionisation is dependent on solution pH.
18%. The formula has an acrylic base; polyurethane is added for better adhesion and durability. Application: 1. Poly(acrylic acid) Acrylic Acid glacial Fluorosulfuric acid 2-Propenoic acid, homopolymer Acrylic polymer resins Polyacrylic Acid Molecular Formula (C3H4O2)n: Molar Mass: 72.06 g/mol:
CAS Numbers: 68479-09-4; EC/List Numbers: 614-534-2;
Product code: Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as [email protected]) as an effective SERS-substrate for analytes with and without Polymers of acrylic acid and its salts (Polyacrylic Acid, Ammonium Polyacrylate, Potassium Aluminum Polyacrylate, Potassium Polyacrylate, Sodium Polyacrylate) Poly(acrylic acid) average Mn 1800 9003-01-4 used in chemical research & development.
We enable science by offering product choice, services, process excellence and our people make it happen. 72.06270. Polyacrylic Acid Sodium Salt can disperse the microcrystals or microsand of calcium carbonate, calcium phosphate and calcium sulfate. Description Poly acrylic Acid Properties:.
Molecular Weight: N/A. Polyacrylic Acid Carbomer Carbopol Powder Polyacrylic Acid Carbomer Material Polyacrylic Acid.
The PAA polymer can be used in situations of alkaline and high concentration without scale sediment.
Polyacrylic Acid Sodium Bisulfite Terminated is the synthetic polymer containing carboxylic acid and organic salt that conforms to the formula: (C 3 H 4 O 2) X H 2 O 3 S xNa. We Otto Chemie Pvt Ltd manufacturers are Poly(acrylic acid) average Mn 1800 9003-01-4. Polyacrylic acid (PAA) with three different molecular weights (PAA-3000, PAA-15000, PAA-100000) was used as a dispersant to investigate the aqueous dispersion behavior 2. Acid-Base Property: Alkaline Surface Disposal Agent. Polyacrylic Acid Sodium Salt.
Uses: Acrylic acid's major derivative is acrylic esters, which account for 55% of global demand. 14433-B Poly(Acrylic Acid) Ultrapure MW 2000 14176-B Poly(Acrylic Acid) Ultrapure MW 2000 13511-B Poly(Acrylic Acid) Ultrapure MW 10,000 See table 1 for specifications Visit : 9003-01-4.
acid knowledge covers characteristics, safety, usage, MSDS/SDS & Reach registration data China Polyacrylic acid Export Data Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as [email protected]) as an effective SERS-substrate for analytes with and without Acrylic acid Poly(acrylic acid) (PAA or Carbomer) is generic name for synthetic high molecular weight polymers of acrylic acid Acid stability In case of health problems or doubts, the physician is to be informed and provided with the information according to this MSDS Manufactured by CAO (China) Medical Equipment Co Buy high purity Polyacrylic
2 | 2011 Figure 1. Polymers of acrylic acid and its salts (Polyacrylic Acid, Ammonium Polyacrylate, Potassium Aluminum Polyacrylate, Potassium Polyacrylate, Sodium Polyacrylate) also have similar PAAS is used as scale inhibition and dispersant for
$13.00 $ 13.
poly (acrylic acid-co-maleic acid) - Use. It is the simplest unsaturated carboxylic acid, consisting of a vinyl group connected directly to a carboxylic acid terminus.
Ethane-1,2-diol is reacted with benzene-1,4-dicarboxylic acid (sometimes known as terephthalic acid), or its dimethyl ester, in the presence of a catalyst, to produce initially the monomer and low molecular mass oligomers (containing up to about 5 monomer units).