Method for manufacture of modified polypropylene compositions

Details Method for manufacture of modified polypropylene compositions Method for manufacture of modified polypropylene compositions

1989-11-17

1992-08-11

Seidleck, James J.

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

Synthetic resins

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

525285, 525323, 525324, 5253274, 5253278, 5253297, 525369, 26421123, 26421124, C08F25502, C08F25504, C08F 626, B29C 4738

Patent

active

051379759

ABSTRACT:
A method for the treatment of melt-grafted polypropylene to improve adhesive properties thereof is disclosed. Molten grafted polypropylene, formed by melt grafting polypropylene with an alpha,beta unsaturated carboxylic acid or anhydride, is treated in melt processing apparatus with a minor amount of an aqueous solution of an alkaline material e.g. an aqueous solution of sodium hydroxide. The thus treated grafted polypropylene is separated from the aqueous solution and recovered e.g. in the form of pellets. The melt-grafted polypropylene may be formed in the melt processing apparatus prior to treatment with the aqueous solution or polypropylene that has been grafted in a previous operation may be fed to the apparatus. The treated polymer may be used in adhesive formulations.

REFERENCES:
patent: 3742093 (1973-06-01), Skidmore
patent: 4283525 (1981-08-01), Rao
patent: 4695608 (1987-09-01), Engler
patent: 4698395 (1987-10-01), Inoue et al.
Abstract JP 54"99193-Derwent (1979).
Abstract JP 44-15422-Derwent (1969).
Abstract JP 43-27421-Derwent (1968).
Abstract 53-18144-Derwent (1978).
Abstract 57-144731-Derwent (1982).
Abstract 57-080406-Derwent (1982).
Abstract 56118411 Derwent (1981).

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