C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
400/3036
C09K 3/10 (2006.01) C08L 53/02 (2006.01) C09J 4/00 (2006.01)
Patent
CA 1293074
A B S T R A C T HOT MELT SEALANT COMPOSITIONS A hot melt sealant composition which comprises:- a. 0-50 parts by weight of a multiblock copolymer having at least two endblocks A and at least one elastomeric midblock B; b. 50-100 parts by weight of one or more diblock copolymers consisting of one block A' and one block B', wherein: the blocks A and A' comprise monoalkenyl arene blocks and the blocks B and B' comprise hydrogenated conjugated diene polymer blocks, and the average molecular weight of the blocks A and A' is greater than the minimum molecular weight needed to obtain microphase separation and domain formation of the blocks A and A', and is less than the maximum molecular weight which would render the polymer incapable of being melt processed; c. 50-400 parts by weight of a midblock compatible component wherein said midblock compatible component is preferentially compatible with block B and B', said component present in a content sufficient to maintain the resultant composition in a pliable condition at room temperature and to maintain Tg of the composition below 10 °C; and d. 0-100 parts by weight of an endblock compatible resin, with said resin being preferentially compatible with block A, being coumarone-indene resin, polystyrene, vinyltoluene-.alpha.-methyl- styrene copolymer or polyindene.
531823
Chin Steven Soohyun
Sanders Andrea
Shell Canada Limited
Smart & Biggar
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