Elastomeric polymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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528297, 528300, 528308, 5283081, 528176, 525437, 525444, C08G 6302

Patent

active

049687786

ABSTRACT:
Elastomeric block co-polyesters having improved elastic and work recovery properties, a high melting point and are stable at high temperatures, have hard segments comprising at least 50 mole percent of polyethylene terephthalate groups and soft segments comprising at least 40 weight percent of the block copolyester. The soft segments, which have a defined structure, are formed by reacting phenolic compounds with a mixture of ethylene oxide and propylene oxide/butylene oxide.

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patent: 4467595 (1984-08-01), Kramers
patent: 4562232 (1985-12-01), Smith
patent: 4581420 (1986-04-01), Smith
patent: 4663399 (1987-05-01), Peters
Charch et al., Textile Research Journal, 29:536-540 (1959).
Japanese Abstract of 53-99296.

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