Preparation of expandable granules, and the production of foams

Details Preparation of expandable granules, and the production of foams Preparation of expandable granules, and the production of foams

1990-08-03

1992-02-25

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

521 79, 521 81, 521180, 521183, 521189, C08J 912

Patent

active

050911260

ABSTRACT:
A process for the preparation of expandable granules based on polyaryl ether sulfones and/or polyether imides, containing from 5 to 20% by weight of a physical blowing agent, the blowing agent and the polymers being mixed in an extruder and subsequently extruded directly into a medium at less than 40.degree. C., and a process for the production of foams from expandable granules based on polyaryl ether sulfones and/or polyether imides, containing from 5 to 20% by weight of a physical blowing agent, the granules being press molded at from 120.degree. to 250.degree. C. and at a pressure of from 5 to 30 bar to form a sheet, and the sheet being subsequently foamed by reducing the pressure, are described.

REFERENCES:
patent: 4308352 (1981-12-01), Knaus
patent: 4535100 (1985-08-01), Krutchen et al.

Affiliated with

Also associated with

Rating

Preparation of expandable granules, and the production of foams does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of expandable granules, and the production of foams , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of expandable granules, and the production of foams will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1891192