Manufacturing foams by stress-induced nucleation

Details Manufacturing foams by stress-induced nucleation Manufacturing foams by stress-induced nucleation

1998-09-28

2000-06-27

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 50, 264 51, 264 53, C08J 900

Patent

active

060807989

ABSTRACT:
The invention disclosed provides a method for inducing nucleation in a polymer by subjecting the polymer containing dissolved gas to an external stress generated, for example, by applying hydrostatic or mechanical pressure. The applied stress restricts the bubble growth so that the foamed materials have small cells and high cell density. Such microcellular foams can be produced over a wide low temperature range, i.e. from the temperature at which the polymer is conditioned with the blowing agent up to about the glass transition temperature of the polymer-blowing agent system. Stress induced nucleation can also be conducted at higher temperatures i.e. up to about the T.sub.g of the neat polymer, leading to foams with larger cells. A variety of homogeneous and heterogeneous foams can be produced by this technique.

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patent: 3663668 (1972-05-01), Fairbanks
patent: 4473665 (1984-09-01), Martini-Vvedensky et al.
patent: 5223545 (1993-06-01), Kumar
patent: 5334356 (1994-08-01), Baldwin
patent: 5369135 (1994-11-01), Campbell et al.
patent: 5670102 (1997-09-01), Perman

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