Radiation curable composition comprising a urethane oligomer hav

Details Radiation curable composition comprising a urethane oligomer hav Radiation curable composition comprising a urethane oligomer hav

1997-06-09

2000-02-08

Berman, Susan W.

Optical waveguides

Optical transmission cable

Ribbon cable

385123, 385126, 385145, 385128, 428378, 522 90, 522 97, 528 65, 528 66, G02B 644, G02B 602, G02B 616, C08G 1828

Patent

active

060235470

ABSTRACT:
A radiation curable composition comprising a urethane oligomer with a polyester backbone which composition, when cured, has improved hydrolytic stability. The composition comprises a urethane oligomer, having a polyester backbone with a number average molecular weight of less than about 1000, wherein the polyester backbone is at least in part based on a diol component wherein at least one carbon at the .beta.-position with respect to a hydroxyl group bears two carbon-containing substituents having a total of at least three carbon atoms. Alternatively, when the composition comprises a urethane oligomer with a number average molecular weight of less than about 2000, having a polyester polyol backbone with a number average molecular weight of less than about 1000, the polyester backbone is at least in part based on a diol component wherein at least one carbon at the .beta.-position with respect to a hydroxyl group bears at least one carbon-containing substituent.

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patent: 5461691 (1995-10-01), Schunck
patent: 5679721 (1997-10-01), Courtoy et al.
Abstract of JP 01152114, Jun. 1989, Japan.
Abstract of JP 04296315, Oct. 1992, Japan.

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