Block copolymers

Details Block copolymers Block copolymers

1998-07-15

2001-05-29

Mullis, Jeffrey (Department: 1711)

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

Synthetic resins

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

C525S259000, C525S263000, C525S267000, C525S273000, C525S285000, C525S299000, C525S302000, C525S309000

Reexamination Certificate

active

06239226

ABSTRACT:

The present invention relates to block copolymers obtainable by reacting
A) monomers selected from the group consisting of styrene, &agr;-methylstyrene, acrylonitrile, methacrylonitrile, methyl methacrylate and maleic anhydride to form blocks A having a glass transition temperature Tg of more than 0° C. and
B) monomers selected from the group consisting of n-butyl acrylate, methyl acrylate and 2-ethylhexyl acrylate to form blocks B having a glass transition temperature Tg of less than 0° C.
at from 100 to 160° C. in the presence of free-radical initiators and N-oxyl radicals.
The present invention also relates to processes for preparing such block copolymers, to their use for producing transparent or translucent films and moldings, and to the transparent or translucent films and moldings obtainable therefrom.
U.S. Pat. No. 5,322,912 discloses processes for preparing styrene homopolymers and copolymers with myrcene.
U.S. Pat. No. 5,412,047 describes processes for preparing homopolymers of n-butyl acrylate.


REFERENCES:
patent: 4581429 (1986-04-01), Solomon et al.
patent: 5322912 (1994-06-01), Georges et al.
patent: 5412047 (1995-05-01), Georges
patent: 5552502 (1996-09-01), Odell et al.
patent: 5627248 (1997-05-01), Koster et al.
patent: 6087451 (2000-07-01), Georges et al.
patent: 01024879 (1987-07-01), None
Macromolecules, vol. 27, No. 12, Jun. 6, 1994, Am. Chem. Soc.

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