Copolymers containing carboxyl groups in aqueous dispersion form

Details Copolymers containing carboxyl groups in aqueous dispersion form Copolymers containing carboxyl groups in aqueous dispersion form

1995-11-13

1998-01-06

Reddick, Judy M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

523122, 523130, 524 3, 524 4, 524 5, 524 43, 524 44, 524 45, 524436, 524457, 524458, 524500, 524501, 524503, 524504, 524516, 525 5423, 525 543, 525 56, 525 57, 525 58, 525 59, 525 72, 525 73, 525 64, 525283, 526201, 526202, C08F 216

Patent

active

057055530

ABSTRACT:
Copolymers containing carboxyl groups in aqueous dispersion form or redispersible powder form and their water-soluble salts, based on ethylenically unsaturated and copolymerizable monomers, the macro-molecules of which contain at least 24% by weight of monomer units carrying carboxyl groups prepared, by emulsion copolymerization initiated by free radicals in the presence of polyvinyl alcohol (PVA) or polyvinylpyrrolidone (PVP) dissolved in the aqueous phase and isolation of the copolymers in aqueous dispersion form, and optionally subsequent removal of water by spray drying to obtain redispersible copolymer powders and processes for their preparation and their use as thickeners in aqueous formulations which copolymers, by conversion into their water-soluble salt forms, are useful as thickening agents having a surprisingly advantageous rheology-modifying action in aqueous systems.

REFERENCES:
patent: 3876596 (1975-04-01), Grubert et al.
patent: 4380600 (1983-04-01), Hosoda et al.
patent: 5100949 (1992-03-01), Takahashi et al.

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