Polycarboxylic acids with higher thickening capacity and better

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

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526209, 526212, 526216, 526240, 526923, 526333, 526240, 526271, 5263182, 5263171, C08F 200

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049962744

ABSTRACT:
Polymer and process of polymerizing a monomer charge containing at least 85% of an olefinically unsaturated carboxyl monomer of 3 to 5 carbon atoms at up to 15% of a copolymerizable comonomer, in the presence of a mixed reaction medium containing an organic solvent and a hydrocarbon solvent in respective weight ratio of 95/5 to 1/99, said organic solvent is selected from ketones, esters, ethers, and alcohols having solubility parameter in the range of 8 to 15 and said hydrocarbon solvent is selected from aliphatic and cyclic aliphatic alkanes containing 4 to 12 carbon atoms and non-benzene aromatics of 7 to 9 carbon atoms. Said organic solvent and said hydrocarbon solvent are preferably liquid at room temperature. Viscosity of the 0.2% by weight polymer is in excess of 15,000 cps, preferably in excess of 20,000 cps, and its clarity is at least 80%, preferably 85% transmittance. Viscosity of 1% mucilages containing 1% sodium chloride salt is greater than 5,000 cps, preferably greater than 8,000 cps.

REFERENCES:
patent: 2798053 (1957-07-01), Brown
patent: 3915921 (1975-10-01), Schlatzer, Jr.
patent: 3940351 (1976-02-01), Schlatzer, Jr.
patent: 4062817 (1977-12-01), Westerman
patent: 4066583 (1978-01-01), Spaulding
patent: 4267103 (1981-05-01), Cohen

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