Thermoplastic segmented elastomeric copolyether-esters and their

Details Thermoplastic segmented elastomeric copolyether-esters and their Thermoplastic segmented elastomeric copolyether-esters and their

1980-06-06

1982-03-23

Phynes, Lucille M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525444, 528296, 528300, 528302, C08G 6376

Patent

active

043213413

ABSTRACT:
Thermoplastic segmented elastomeric copolyether-esters which substantially consist of a plurality of recurring short-chain and long-chain ester units linked to one another by ester bonds, the proportion of the short-chain ester units of the formula ##STR1## where R is the divalent radical remaining after removal of the carboxyl groups of aromatic dicarboxylic acids having a molecular weight of <350 and A is the divalent radical remaining after removal of the hydroxyl groups of a diol having a molecular weight of <250, being from 15 to 75% by weight, and the proportion of the long-chain ester units of the formula ##STR2## where R is defined as above and B is the divalent radical remaining after removal of the terminal hydroxyl groups from a long-chain glycol, being from 25 to 85% by weight of the copolyester, and which contain from 0.01 to 5 mole %, based on copolyester, of trifunctional or more highly functional compounds, serving as branching agents, chemically incorporated into the polymer molecule. The copolyesters are particularly suitable for use in pressure-sensitive adhesives.

REFERENCES:
patent: 3832314 (1974-08-01), Holt et al.
patent: 3932326 (1976-01-01), Holt et al.
patent: 4013624 (1977-03-01), Hoeschele
patent: 4025694 (1977-05-01), Pletcher et al.
patent: 4122073 (1978-10-01), Georgoudis
patent: 4124571 (1978-11-01), Georgoudis

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