Process for preparing chain-extended organopolysiloxanes

Details Process for preparing chain-extended organopolysiloxanes Process for preparing chain-extended organopolysiloxanes

1998-10-14

2000-03-21

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 12, 528 14, 528 17, 528 21, 528 23, 525477, C08G 7704

Patent

active

060404124

ABSTRACT:
This specification describes and claims a process for preparing chain-extended organopolysiloxanes. The process comprises the steps of: A) mixing organopolysiloxanes having at least one silicon-bonded hydroxyl group per molecule with a polymerization catalyst to form a mixture, B) allowing the mixture of step A to react so as to produce a reaction product comprising polymerized organopolysiloxanes of which some have at least one silicon-bonded hydroxyl group per molecule and C) allowing the silicon-bonded hydroxyl group containing organopolysiloxanes of the reaction product of step B to react with a nitrogen-containing silylating agent capable of chain-extending to produce a chain-extended organopolysiloxane. Preferably the silylating agent is a cyclosilazane. Organopolysiloxanes having terminal groups other than silicon-containing hydroxyl groups and which are capable of equilibrating with the mixture of step A and/or the reaction product of step B may also be introduced prior to step C. The chain-extended organopolysiloxanes are suitable for use in sealant compositions.

REFERENCES:
patent: 3133110 (1964-05-01), Morehouse et al.
patent: 4012375 (1977-03-01), Hahn
patent: 4725643 (1988-02-01), Burkhardt
patent: 4835237 (1989-05-01), Burkhardt et al.
patent: 4902813 (1990-02-01), Wegehaupt et al.

Affiliated with

Also associated with

Rating

Process for preparing chain-extended organopolysiloxanes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing chain-extended organopolysiloxanes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing chain-extended organopolysiloxanes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-731289