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US 8,419,890 B2Granted
Composition for structural adhesive
AssigneeJacret
InventorsArnaud Curet, Régis David
Life of this patent
Estimating the term…
Abstract
The invention relates to composition for an acrylic structural adhesive containing a mixture of block copolymers containing styrene and an elastomer.
Claims20
A composition that can be used in a structural adhesive, comprising:
- (a) 20-80% by weight of at least one methacrylate ester monomer;
- (b) an elastomeric block copolymer styrene-isoprene-styrene;
- (c) at least one elastomeric block copolymer selected from a styrene-butadiene-styrene copolymer (SBS) and a styrene-isoprene-butadiene-styrene copolymer (SIBS);
- and
- (d) 4-20% by weight of at least one elastomer, wherein said elastomer is polybutadiene,
- wherein said composition comprises between 10 and 30% by weight of the mixture of said elastomeric block copolymer (b) and said elastomeric block copolymer (c), and the proportion of said elastomeric block copolymer (b) to said elastomeric block copolymer (c) is 4:1 to 1.5:1, and wherein said composition has an elongation at break equal to or greater than 70%.
3 more elements
A method for preparing a composition that can be used as a structural adhesive, wherein said composition has an elongation at break equal to or greater than 70% and a tensile shear strength equal to or greater than 15 MPa on aluminium, comprising mixing at least one methacrylate ester monomer;
- an elastomeric block copolymer styrene-isoprene-styrene;
- at least one elastomeric block copolymer selected from a styrene-butadiene-styrene copolymer (SBS) and a styrene-isoprene-butadiene-styrene copolymer (SIBS);
- and polybutadiene to form a composition, wherein said composition comprises 20-80% by weight of at least one methacrylate ester monomer, between 10 and 30% by weight of the mixture of said elastomeric block copolymer (b) and said elastomeric block copolymer (c) wherein the proportion of said elastomeric block copolymer (b) to said elastomeric block copolymer (c) is 4:1 to 1.5:1, and between 4 and 20% by weight of said polybutadiene (d) by weight.
Dependencies are inferred from the claim text.