Process for producing polypropylene foam

Details Process for producing polypropylene foam Process for producing polypropylene foam

1987-06-22

1988-08-23

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264DIG17, 264 54, 521140, 521143, 521144, 521915, 521 515, C08J 906

Patent

active

047661593

ABSTRACT:
The invention relates to the process of the invention provides a radiation-crosslinked polypropylene foam by extrusion at a low temperature (about 170.degree. C.) below the decomposition point of the blowing agent. The resulting foamed item has by far better heat resistance than conventional ones.
The raw resin can be prepared by mixing a resin in the pellet form and a blowing agent in the powder form on account of the low-temperature flowability. Heretofore, such mixing was impossible because the blowing agent does not disperse completely.
This outstanding effect of the invention was not expected at all from the known prior arts.

REFERENCES:
patent: 3882209 (1975-05-01), Yanagisawa et al.
patent: 4154785 (1979-05-01), Inui et al.
patent: 4303757 (1981-12-01), Kajimura et al.
patent: 4367185 (1983-01-01), Nojiri et al.
patent: 4421867 (1983-12-01), Nojiri et al.
patent: 4424293 (1984-01-01), Nojiri et al.

Affiliated with

Also associated with

Rating

Process for producing polypropylene foam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing polypropylene foam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing polypropylene foam will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-836323