High-strength films of block copolymer latices

Details High-strength films of block copolymer latices High-strength films of block copolymer latices

1995-06-06

1996-10-08

Michl, Paul R.

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...

524575, 524556, 524484, 524487, 525 89, 525 99, 525316, 523335, C08J 303, C08K 501, C08L 5300

Patent

active

055632041

ABSTRACT:
An aqueous dispersion is claimed which is capable of forming a free-standing, coherent, elastomeric, solid film which, after drying and annealing at 80.degree. C. for 30 minutes, demonstrates a tensile strength of about 11.0 MPa or greater wherein the dispersion comprises: I. an organic phase comprising: (a) one or more block copolymer(s) corresponding to the formula A-B-X.sub.m -(B-A).sub.n, wherein each A polymer block consists essentially of a monovinylidene aromatic monomer, having a weight average molecular weight from about 8,000 to about 15,000 Daltons, each B polymer block consists essentially of a conjugated diene and, optionally, a monovinylidene aromatic monomer having a weight average molecular weight from about 30,000 to about 200,000 Daltons, X is the remnant of a multifunctional coupling agent, m is 0 or 1, and n is an integer from 1 to 5, and (b) optionally, an extender for the block copolymer which is compatible with the B block; II. a surfactant; and III. water, wherein the A block effective phase volume in the organic phase is from about 5 to about 20 percent.

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Derwent Number 77-51183Y, Derwent Publications Ltd., London, GB.
Block Polymers,"Preceedings of the Symposium on Block Polymers at the Meeting of the American Chemical Society in New York City in Sep. 1969," Plenum Press, New York, 1970, pp. 79-103.
Chemical abstract CA77:89674H.

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