Blowing agent
OwnerM. Karl Brandtinventor
Life of this patent
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Abstract
The present invention relates to a composition for use as a blowing agent in injection molding processes. More specifically, the present invention is a blowing agent composition comprising a molecular sieve and a foaming agent, wherein the foaming agent is carried by the molecular sieve and evolves to form foamed plastic products. In addition, the present invention is a foamed plastic resin containing a molecular sieve. Additionally, the present invention provides a composition and method for foaming moisture-sensitive polymers comprising the addition of molecular sieves and a poly-hydroxy ester. The present invention is also an encapsulated blowing agent on a polymer substrate.
Claims16
A composition for use as a blowing agent for foaming a resin, said composition comprising:
- a first molecular trap having a pore size;
- a second molecular trap mixed with said first molecular trap, said second molecular trap having a pore size that is different than said pore size of said first molecular trap;
- and
- a foaming material, said foaming material being carried by a preselected quantity of said second molecular trap, said foaming material evolving from said molecular trap at a preselected temperature and pressure to foam the resin,
- wherein said first molecular trap is a type 3A molecular sieve, and wherein said second molecular trap has a pore size greater than 3A.
A composition for use as a blowing agent for foaming a resin, said composition comprising:
- a first molecular trap having a pore size less than 3A;
- a second molecular trap mixed with said first molecular trap, said second molecular trap having a pore size greater than 3A;
- and
- a foaming material, said foaming material being carried by a preselected quantity between approximately 10% and 30% by weight of said second molecular trap, said foaming material evolving from said molecular trap at a preselected temperature and pressure to foam the resin.
Dependencies are inferred from the claim text.