Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2008-09-18
2010-10-19
Jagannathan, Vasu (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C524S366000, C524S378000, C524S379000, C524S612000, C525S185000, C525S199000, C525S258000, C525S385000, C526S242000, C526S250000, C526S253000, C526S255000, C526S291000, C526S294000, C528S401000, C570S123000, C570S126000, C570S138000
Reexamination Certificate
active
07816468
ABSTRACT:
Fluoroelastomer gum or crumb is isolated from fluoroelastomer dispersions by the addition of a water-soluble polymeric coagulating agent to the dispersion. This coagulating agent comprises either a homopolymer of ethylene oxide (CH2CH2O—) or a copolymer of ethylene oxide. Specific examples of such copolymers include, but are not limited to ethylene oxide-propylene oxide copolymers and ethylene oxide-butylene oxide copolymers. The viscosity average molecular weight (Mv), determined by rheology, of the coagulant polymer must be at least 500,000 and preferably greater than 2,000,000.
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DuPont Performance Elastomers LLC
Huhn Richard A
Jagannathan Vasu
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