C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/148, 400/201
C08G 18/66 (2006.01) C08G 18/42 (2006.01) C08J 5/18 (2006.01) C08K 3/36 (2006.01) C08L 75/06 (2006.01)
Patent
CA 1335619
Soft linear thermoplastic polyurethanes, which have low permanent set, high tear propagation resistance, and low blocking, and which are extrud- able by blown film techniques, are prepared by reacting one mole of a hydroxyl terminated poly- ester having a molecular weight from about 1800 to about 3600, from about 0.5 to about 2.0 moles of an aromatic glycol chain extender, and an organic diioscyanate in molar quantities substantially equal to the sum of the molar quantities of poly- ester and chain extender. The polyester is a mixed polyester prepared by reacting at least two dif- ferent alaphatic glycols with one or more organic dicarboxcylic acids or at least one alaphatic glycol with two or more organic dicarboxcylic acids. The aliphatic glycol may have from 2 to about 10 carbon atoms. The organic dicarboxcylic acid may be either aliphatic or aromatic and may have from 2 to about 12 carbon atoms. The pre- ferred chain extender is hydroquinone bis(beta-hydroxyethyl)ether. Polymers of this invention are useful as elastic tapes, and in particular as leg bands in diapers and adult incon- tinence garments. They may be used for other items of form-fitting apparel, such as ladies swim suits.
576081
Hall Dale Ritchey
Keller Dennis James
Noveon Ip Holdings Corp.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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