An adhesive composition which is the crosslinked product of components which comprise (C) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer of (meth)acrylic ester
An adhesive composition which is the crosslinked product of components which comprise (C) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer of (meth)acrylic esters having a weight-average molecular weight of 1,000 to 10,000 and (E) 0.001 to 50 parts by weight per 100 parts by weight of component (C) of a crosslinking component comprising a difunctional crosslinking agent. The adhesive composition exhibits excellent adhesion with adherents, and stress relaxation and follows changes in the dimensions of substrates.
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What is claimed is: 1. An adhesive composition which is a crosslinked product of components which comprise (C) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer
What is claimed is: 1. An adhesive composition which is a crosslinked product of components which comprise (C) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer of (meth) acrylic esters having a weight-average molecular weight of 1,000 to 10,000 and (E) 0.001 to 50 parts by weight per 100 parts by weight of component (C) of a crosslinking component comprising a difunctional adduct of a polyisocyanate compound. 2. The adhesive composition according to claim 1, wherein the copolymer of (meth)acrylic esters of component (C) comprises 0.01 to 10% by weight of a monomer unit having a crosslinking functional group in a molecule. 3. The adhesive composition according to claim 1, wherein the oligomer of (meth)acrylic esters of component (D) has a ratio of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn) of 2.0 or smaller. 4. The adhesive composition according to claim 1, wherein the crosslinking component (E) further comprises a crosslinking agent having a functionality of three or greater in amounts such that a ratio of the amounts by weight of the difunctional adduct of a polyisocyanate compound and the crosslinking agent having a functionality of three or greater is 95:5 to 30:70. 5. The adhesive composition according to claim 1, wherein the crosslinking component (E) comprises 0.01 to 10 parts by weight of an adduct of a polyisocyanate compound per 100 parts by weight of component (C). 6. The adhesive composition according to claim 1, wherein the copolymer of the (meth)acrylic ester has a weight-average molecular weight of 1,200,000 to 2,200,000 and has a content of a crosslinking functional group of 0.01 to 10% by weight. 7. The adhesive composition according to claim 6, wherein the oligomer of (meth)acrylic esters has a weight-average molecular weight of 4,000 to 10,000 and has a ratio of the weight-average molecular weight to a number-average molecular weight of 2.0 or less. 8. An optical component in combination with an adhesive composition, wherein the adhesive composition is a crosslinked product of components which comprise (C) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer of (meth)acrylic esters having a weight-average molecular weight of 1,000 to 10,000 and (E) 0.001 to 50 parts by weight per 100 parts by weight of component (C) of a crosslinking component comprising a difunctional adduct of a polyisocyanate compound. 9. The optical component in combination with the adhesive composition according to claim 8, wherein the optical component is a polarizing plate. 10. The optical component in combination with an adhesive composition according to claim 8, wherein the copolymer of the (meth)acrylic ester has a weight-average molecular weight of 1,200,000 to 2,200,000 and has a content of a crosslinking functional group of 0.01 to 10% by weight. 11. The optical component in combination with an adhesive composition according to claim 10, wherein the oligomer of (meth)acrylic esters has a weight-average molecular weight of 4,000 to 10,000 and has a ratio of the weight-average molecular weight to a number-average molecular weight of 2.0 or less. 12. An adhesive sheet comprising a substrate sheet and a layer which comprises an adhesive composition which is disposed on at least one face of the substrate sheet, the adhesive composition being a crosslinked product of components which comprise (C) a copolymer of a (meth)acrylic ester having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer of (meth)acrylic esters having a weight-average molecular weight of 1,000 to 10,000 and (E) 0.001 to 50 parts by weight per 100 parts by weight of component (C) of a crosslinking component comprising a difunctional adduct of a polyisocyanate compound. 13. The adhesive sheet according to claim 12, wherein the copolymer of the (meth)acrylic ester has a weight-average molecular weight of 1,200,000 to 2,200,000 and has a content of a crosslinking functional group of 0.01 to 10% by weight. 14. The adhesive sheet according to claim 13, wherein the oligomer of (meth)acrylic esters has a weight-average molecular weight of 4,000 to 10,000 and has a ratio of the weight-average molecular weight to a number-average molecular weight of 2.0 or less. 15. An adhesive optical component comprising an optical component in a form of a sheet and a layer which comprises an adhesive composition which is disposed on at least one face of the optical component, the adhesive composition being a crosslinked product of components which comprise (C) a copolymer of (meth)acrylic esters having a weight-average molecular weight of 1,000,000 or greater, (D) 5 to 100 parts by weight per 100 parts by weight of component (C) of an oligomer of (meth)acrylic esters having a weight-average molecular weight of 1,000 to 10,000 and (E) 0.001 to 50 parts by weight per 100 parts by weight of component (C) of a crosslinking component comprising a difunctional adduct of a polyisocyanate compound. 16. The adhesive optical component according to claim 15, wherein the copolymer of the (meth)acrylic ester has a weight-average molecular weight of 1,200,000 to 2,200;000 and has a content of a crosslinking functional group of 0.01 to 10% by weight. 17. The adhesive optical component according to claim 16, wherein the oligomer of (meth)acrylic esters has a weight-average molecular weight of 4,000 to 10,000 and has a ratio of the weight-average molecular weight to a number-average molecular weight of 2.0 or less.
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