Patent ID: 6887911
Filing Date: 2005-05-03
Classification: B29C,C08G,C08L

Abstract:
1. A reaction system suitable for the production of expanded moldings by the RIM process comprising: a polyisocyanate composition, including a polyisocyanate having a number averaged isocyanate group functionality of at least 1.8; an isocyanate reactive organic composition including at least one organic polyol having a number averaged functionality of primary and/or secondary alcohol groups of at least 1.8; at least one blowing agent; at least one fatty compound of 10 carbon atoms or greater selected from the group consisting of a fatty polyester, a fatty acid ester, and a fatty amide; and a polysiloxane composition including an effective amount of at least one polydimethylsiloxane polyoxyalkylene copolymer containing greater than 60 siloxane linkages; wherein the polydimethylsiloxane polyoxyalkylene copolymer containing greater than 60 siloxane linkages conforms to the following formula I: wherein R, R′, R″, and R′″″ may be the same or different and at least 80 mole percent of the groups R, R′, R″, and R′″″ are CH 3 groups; all of the groups R, R′, R″, and R′″″ are hydrocarbon groups of 10 carbons or fewer; the number averaged value of n is from 60 to 500; the number averaged value of m is from 2 to 10; the groups R′″ and R″″ may be the same or different and are selected from the group consisting of aliphatic hydrocarbons of 4 carbons or fewer and polyoxyalkylene blocks according to formula II; and at least one of the groups selected from R′″ and R″″ is a polyoxyalkylene block according to formula II: wherein PO denotes an oxypropylene unit, EO denotes an oxyethylene unit, and AO denotes an optional oxyalkylene unit of greater than three carbon atoms; the ratio of z to the quantity x+y+z is less than 1/5; the number averaged value of x is from 15 to 30; the number averaged value of y is from 8 to 40; the ratio of x/y is from 1 to 5; the group L is an optional divalent linking group which, when present, is a divalent hydrocarbon group having fewer than 20 carbon atoms; and the group T is selected from the group consisting of H and hydrocarbon groups of less than 20 carbon atoms; and wherein the at least one fatty compound comprises an inert aliphatic compound that is free of aromatic rings.