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:
Feb. 23, 1993
Filed:
May. 29, 1992
Thomas F Brownscombe, Houston, TX (US);
William P Gergen, Houston, TX (US);
Ronald M Bass, Houston, TX (US);
Maryanne Mores, Houston, TX (US);
Pui K Wong, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
In a process for the preparation of a low density porous crosslinked polymeric material by polymerizing a water-in-oil high internal phase emulsion, curing time of the monomers in the emulsion can be reduced without adversely affecting polymer properties or substantially affecting the emulsion by carrying out the curing in multiple-stages. The emulsion is first pre-cured at a temperature less than about 65.degree. C. until the emulsion reaches a Rheometrics dymanic shear modulus of at least about 500 and subsequently curing at a temperature above about 70.degree. C.