Method of producing thermoplastic elastomers having alternate cr

Details Method of producing thermoplastic elastomers having alternate cr Method of producing thermoplastic elastomers having alternate cr

1990-07-27

1996-05-14

Miller, Edward A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C08G 1812, C08G 6504

Patent

active

055168540

ABSTRACT:
A method of preparing a thermoplastic elastomer having A blocks and at least one B block, wherein said A blocks are crystalline at temperatures below about 60.degree. C. and said B block is amorphous at temperatures above about -20.degree. C., said A blocks each being polyethers derived from monomers of oxetane and its derivatives and/or tetrahydrofuran and its derivatives, the method comprising:
providing monofunctional hydroxyl terminated A blocks which are crystalline at temperatures below about 60.degree. C. and separately providing di-, tri- or tetrafunctional hydroxyl terminated B blocks which are amorphous at temperatures above about -20.degree. C.,
end-capping said A blocks by separately reacting said A blocks with a difunctional diisocyanate in which one isocyanate moiety is at least about five times as reactive with the terminal hydroxyl group of the A blocks as the other isocyanate moiety, whereby the more reactive isocyanate moiety tends to react with the terminal hydroxyl group of the A blocks, leaving the less reactive isocyanate moiety free and unreacted, and
adding di-, tri- or tetrafunctional B block to the end-capped A blocks at approximately the stoichiometric ratios that they are intended to be present in the thermoplastic elastomer such that the free and unreacted isocyanate moiety on the end-capped A block reacts with a functional moiety of the B block to produce ABA or A.sub.n B thermoplastic elastomers.

REFERENCES:
patent: 4361526 (1982-11-01), Allen
patent: 4393199 (1983-07-01), Manser
patent: 4483978 (1984-11-01), Manser
patent: 4806613 (1989-02-01), Wardle
patent: 4952644 (1990-08-01), Wardle et al.
patent: 5210153 (1993-05-01), Manser et al.
patent: 5362848 (1994-11-01), Archibald et al.

Affiliated with

Also associated with

Rating

Method of producing thermoplastic elastomers having alternate cr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of producing thermoplastic elastomers having alternate cr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing thermoplastic elastomers having alternate cr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1896449