Block copolymer, method of making the same, dimaine precursors o

Details Block copolymer, method of making the same, dimaine precursors o Block copolymer, method of making the same, dimaine precursors o

1990-11-16

1993-05-25

Dean, Jr., Ralph H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 14, 528 22, 528 37, 528 38, 528 29, C08L 77458

Patent

active

052141195

ABSTRACT:
Block copolymers having a repeating unit comprised of polysiloxane and urea segments are prepared by copolymerizing certain diaminopolysiloxanes with diisocyanates. The invention also provides novel diaminopolysiloxanes useful as precursors in the preparation of the block copolymers and a method of making such diaminopolysiloxanes. Pressure sensitive adhesive compositions comprising the block copolymer are also provided as are sheet materials coated with the same.

REFERENCES:
patent: 3562352 (1971-02-01), Nyilas
patent: 4518758 (1985-05-01), Cavezzan et al.
patent: 4528343 (1985-07-01), Kira
Abstract No. 89-188438, Release agent for adhesive tape, etc. comprises resin having siloxane] segments, other release materials and solvents.
Polymer, vol. 25, pp. 1800-1816, Dec., 1984.

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