Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2007-04-24
2007-04-24
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C525S098000, C525S099000, C525S197000, C525S938000, C528S481000, C528S50200C, C585S012000
Reexamination Certificate
active
11203065
ABSTRACT:
A process is described for the preparation of viscosity index improver (V.I.I.) additives which includes treatment under high shear conditions of a composition comprising (i) one or more EP(D)M polymers and (ii) one or more polyvinylarene/hydrogenated conjugated diene/polyvinylarene block copolymers, the weight ratio (i)/(ii) ranging from 98:2 to 80:20, preferably from 97:3 to 90:10, the above process being carried out at a temperature ranging from 150° C. to 400° C., preferably from 180° C. to 320° C.
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Database WPI; Section Ch; Week 199808; Derwent Publications Ltd., London, GB, Class A12; AN 1998 082810; XP002311963; May 24, 1996.
Polimeri Europa S.p.A.
Teskin Fred
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