PVC foam

Details PVC foam PVC foam

2000-04-19

2001-05-01

Foelak, Morton (Department: 1711)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S079000, C521S145000

Reexamination Certificate

active

06225365

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to polyvinyl chloride (“PVC”) foam made with physical blowing agents, more particularly to PVC foam blown with one or more gaseous hydrofluorocarbons (“HFC”s) such as HFC-134
a
(1,1,1, 2-tetrafluoroethane).
There are publications (such as “Inert-Gas Extrusion of Rigid PVC Foam” by S. K. Dey et al in the Journal of Vinyl & Additive Technology, March 1996, Vol. 2, No. 1) disclosing the use of inert gaseous blowing agents (such as CO
2
) and chemical blowing agents (such as azodicarbonamide) for making PVC foams. Chemical blowing agents present disadvantages such as the leaving of residues in the foam and inflexible processing since the blowing agent is water sensitive and usually must be premixed with the PVC. Inert blowing agents such as CO
2
tend to restrict the ability to vary the foam density, generally resulting in high density foams. What is desired is a blowing agent which provides processing flexibility and the ability to achieve a range of densities.
BRIEF SUMMARY OF THE INVENTION
PVC foam blown with a physical blowing agent comprising a gaseous HFC is provided.


REFERENCES:
patent: 4456572 (1984-06-01), Eguchi et al.
patent: 5278196 (1994-01-01), Robin
patent: 5710189 (1998-01-01), Brandt
patent: 03273035 A2 (1991-06-01), None
“Inert-Gas Extrusion of Rigid PVC Foam” by S.K. Dey et al in the J. of Vinyl & Additive Technology, vol. 2, No. 1, Sep. 1996.

Affiliated with

Also associated with

Rating

PVC 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 PVC foam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PVC foam will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2459157