| 摘要 |
A release modifier which comprises (i) a MQ resin consisting essentially of units of the formulae SiO2 and R3SiO1/2 wherein R denotes a monovalent hydrocarbon group having up to 3 carbon atoms, a hydrogen atom, a c2-5 alkenyl group of the formula -R'CH=CH2, provided there is at least one group - R'CH=CH2 present per MQ molecule and (ii) a alpha , omega -diolefin having the general formula CH2=CH-(CH2)n-CH=CH2, wherein n denotes an integer with a value of from 4 to 18 gives improved release force over prior art controlled release additives. Also claimed is a solventless release composition based on siloxanes having SiH groups and a catalyst in addition to the release modifier. |
