Back to results
US 6,617,295 B2Granted
Composition and method for foaming resin
AssigneePolyOne Corporation
InventorNorman E. Nitzsche
Life of this patent
Estimating the term…
Abstract
The present invention relates to a composition which can be utilized to induce foaming of a resin or polymeric material in polymer processing machinery. The composition of the present invention includes a blowing agent which decomposes and evolves gases thereby causing the polymeric material to foam. The compositions of the present invention allow for reductions in part weight, cycle times and injection pressure.
Claims20
A composition which foams upon being heated to predetermined temperature, comprising:
- a blowing agent;
- a binder component in an amount from about 10 to about 100 parts by weight, said binder component being a wax having a weight average molecular weight of less than 10,000;
- a surfactant in an amount from about 1 to about 50 parts by weight;
- and a filler component in an amount from about 5 to about 75 parts by weight, wherein said composition has been processed at a temperature below an activation temperature of said blowing agent in order to prevent premature degradation, wherein said composition is in a solid particulate form;
- and wherein said parts by weight are based on 100 parts by weight of said blowing agent.
2 more elements
A method for preparing a foamable composition for use in polymeric materials, comprising the steps of:
- compounding said foamable composition comprising at least one blowing agent, a binder component in an amount from about 10 to about 100 parts by weight, said binder component being a wax having a weight average molecular weight of less than 10,000, a surfactant in an amount from about 1 to about 50 parts by weight, a filler component in an amount from about 5 to about 75 parts by weight and optionally, a functional comnounding additive, said parts by weight based on 100 parts by weight of said blowing agent;
- mixing said composition at a temperature below the activation temperature of said blowing agent;
- and cold compression molding said composition into a particulate form.
Dependencies are inferred from the claim text.