| 摘要 |
An organopolysiloxane copolymer, comprising (i) R<1>SiO3/2 units, (ii) random R<2>2SiO2/2 units, and (iii) linear (R<3>2SiO)n units, wherein R<1 >is independently hydrocarbyl or halogen-substituted hydrocarbyl, R<2 >and R<3 >are independently R<1 >or H, n has an average value of from 5 to 500, the mole ratio of R<1>SiO3/2 units to R<2>2SiO2/2 units is from 1 to 30, and the mole ratio of R<1>SiO3/2 units and R<2>2SiO2/2 units combined to (R<3>2SiO)n units is from 3 to 600 when the copolymer contains aliphatic unsaturation or from 1 to 600 when the copolymer is free of aliphatic unsaturation; and a method of preparing the organopolysiloxane copolymer.
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