Process for making polypropylene graft copolymers containing anh

Details Process for making polypropylene graft copolymers containing anh Process for making polypropylene graft copolymers containing anh

1997-08-25

2000-10-31

Mullis, Jeffrey C.

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

Synthetic resins

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

525301, 525302, 525303, 525307, 525309, 525320, C08F25500, C08F25504

Patent

active

06140425&

ABSTRACT:
A graft copolymer containing anhydride groups is made by (1) making a graft copolymer comprising a backbone of a propylene polymer material having graft polymerized thereto polymerized monomers selected from the group consisting of (a) at least one acrylic acid substituted with a 1-3 C alkyl group and (b) a mixture of at least one of these substituted acrylic acids and a vinyl compound capable of copolymerizing therewith, wherein the total amount of polymerized monomers is about 20 parts to about 240 parts per hundred parts of the propylene polymer material and the amount of the substituted acrylic acid is 60 mole % or more of the polymerized monomers, and (2) heating the graft copolymer to a temperature of about 170.degree. C. to about 300.degree. C. to dehydrate the acid groups in the graft copolymer to form anhydride groups.

REFERENCES:
patent: 4727117 (1988-02-01), Hallden-Abberton et al.
patent: 4742123 (1988-05-01), Kopchik
patent: 5140074 (1992-08-01), DeNicola, Jr. et al.
patent: 5401784 (1995-03-01), Boillot et al.
patent: 5411994 (1995-05-01), Galli et al.
patent: 5504153 (1996-04-01), Amici et al.

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