| 摘要 |
<p>1,174,653. Polyorganosiloxanes; polyurethane foam. DOW CORNING CORP. 4 April, 1967 [2 May, 1966], No. 15387/67. Headings C3C, C3R and C3T. Polyorganosiloxanes, useful as surfactants in the preparation of rigid polyurethane foams, have one of the average formula In each formula R is a saturated C 1-10 hydrocarbon radical; A is a radical -D(OC 2 H 4 ) f G where D is an alkylene radical and G is -OCOR, OCOOR or OCONHR, f having an average value of 9 to 30; a is 0 or 1; b has an average value of 6 to 192, c from 0 to 30, d from 3 to 30 and e from 1 to 30. The ratio of OSi(CH 3 ) 2 to the OSi(CH 3 )A and/or OSi(CH 3 ) 2 A units in the siloxane ranges from 2 : 1 to 6 : 1. In preferred siloxanes A is a radical of in which f is 12 and R is an ethyl radical.</p> |
