Self-adhesive of renewable origin with temperature-stable adhesive power

摘要

Heat-curable adhesive composition:
47-60% of polyether/polyurethane bearing alkoxysilane end groups and polyurethanes bearing alkoxysilane end groups of formula (II):;in which: R6 is a divalent C5-C15 hydrocarbon-based radical; R7 is a divalent C1-C3 alkylene radical; R8 and R9 are a C1-C4 alkyl; q is 0, 1 or 2; r is such that the number-average molar mass of the polymers of formula (II) is between 900 Da and 11 kDa; R10 is a divalent polyester block with a hydroxyl number IOH of between 40 and 60 mg KOH/g;37-50% of a compatible tackifying resin; and0.01-3% of a crosslinking catalyst.

主权项

1. A heat-curable adhesive composition comprising:
(α) from 47% to 60% weight/weight of a composition (A) comprising polymers bearing hydrolyzable alkoxysilane end groups which composition (A) is: from 10% to 50% weight/weight of a polymer (A1) of formula (I): in which: R1 represents a divalent hydrocarbon-based radical comprising from 5 to 15 carbon atoms, which may be aromatic or aliphatic, and linear, branched or cyclic; R2 represents a linear or branched divalent alkylene radical comprising from 1 to 4 carbon atoms; R3 represents a linear divalent alkylene radical comprising from 1 to 3 carbon atoms; R4 and R5, which may be identical or different, each represent a linear or branched alkyl radical of 1 to 4 carbon atoms; n is an integer such that the number-average molar mass of the polyether block of formula —[OR2]n— is between 300 Da and 30 kDa; m is either equal to 0 or a non-zero integer such that the number-average molar mass of the polymer of formula (I) is between 600 Da and 60 kDa; p is an integer equal to 0, 1 or 2; and from 50% to 90% weight/weight of a composition (A2) comprising at least 85% weight/weight of polyurethanes bearing hydrolysable alkoxysilane end groups of formula (II): in which: R6 represents a divalent hydrocarbon-based radical comprising from 5 to 15 carbon atoms, which may be aromatic or aliphatic, and linear, branched or cyclic; R7 represents a linear divalent alkylene radical comprising from 1 to 3 carbon atoms; R8 and R9, which may be identical or different, each represent a linear or branched alkyl radical of 1 to 4 carbon atoms; q is an integer equal to 0, 1 or 2; r is a number such that the number-average molar mass of the polymers of formula (II) is between 900 Da and 11 kDa; R10 represents a divalent polyester block of formula (III): in which: R11 represents a divalent hydrocarbon-based radical which is derived from a dimerized fatty alcohol by replacement of each of the two hydroxyl groups with a free valency, the said alcohol having a hydroxyl number IOH of between 200 and 220 mg KOH/g; R12 represents a divalent hydrocarbon-based radical which is derived from a dimerized fatty acid by replacement of each of the two carboxyl groups —COOH with a free valency, the said acid having an acid number IA of between 190 and 200 mg KOH/g; s is a number such that the polyester diol of formula IV:
OH—R10—OH  (IV) has a hydroxyl number IOH of between 40 and 60 mg KOH/g; (β) from 37% to 50% weight/weight of a compatible tackifying resin (B) with a number-average molar mass of between 200 Da and 10 kDa; and (γ) from 0.01% to 3% weight/weight of a crosslinking catalyst (C).