The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 1997
Filed:
Nov. 17, 1995
Thomas Fairchild Brownscombe, Houston, TX (US);
Ronald Marshall Bass, Houston, TX (US);
Pui Kwan Wong, Houston, TX (US);
George Constantine Blytas, Houston, TX (US);
William Peter Gergen, Houston, TX (US);
Maryanne Mores, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
A process is provided for the production of a porous crosslinked polymeric foam comprising the steps of: (a) providing a first water-in-oil emulsion comprising (i) a first mixture of polymerizable monomers comprising at least one oil-soluble vinyl monomer and from about 2 to about 70 weight percent, based on the mixture, of a multifunctional unsaturated crosslinking monomer, (ii) at least 70 weight percent, based on the emulsion, of water as the internal phase (iii) an effective amount to produce the water-in-oil emulsion of a first surfactant, and (iv) a first polymerization initiator; (b) providing a second water-in-oil emulsion comprising (i) a mixture of polymerizable monomers comprising at least one oil-soluble vinyl monomer and from about 2 to about 70 weight percent, based on the mixture, of a second multifunctional unsaturated crosslinking monomer, (ii) at least 70 weight percent, based on the emulsion, of water as the internal phase (iii) an effective amount to produce the water-in-oil emulsion of a second surfactant, and (iv) a second polymerization initiator; (c) combining the first and second emulsions; and (d) curing said polymerizable monomers under conditions effective to polymerize and crosslink the polymer prior to significant diffusion between the emulsions. Polymeric foams can be prepared by this process that exhibit positive attributes of foams formed by curing of each of the emulsions individually.