Two-pack curable adhesive composition
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsHirokazu KAGEYAMA, Kazushi KIMURA, Yutaro YAMAMOTO
Life of this patent
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Abstract
The two-part curable adhesive composition contains a main agent (A) containing a urethane prepolymer (a1) and a residual polyisocyanate (a2), and a curing agent (B) containing a polyol compound (b1) and a polyamine compound (b2). The urethane prepolymer (a1) is made by reacting in an equivalent ratio of an isocyanate group in a raw material polyisocyanate to a hydroxy group in a polycarbonate polyol being 2.05 or greater. The equivalent ratio of an isocyanate group in the main agent (A) to an active hydrogen group in the curing agent (B) is from 0.5 to 4.
Claims13
A two-part curable adhesive composition comprising a main agent (A) containing a urethane prepolymer (a1), and a curing agent (B) containing a polyol compound (b1) and a polyamine compound (b2),
- the urethane prepolymer (a1) being made by reacting a raw material polyisocyanate and a polycarbonate polyol in an equivalent ratio of an isocyanate group in the raw material polyisocyanate to a hydroxy group in the polycarbonate polyol being 2.05 or greater with all of the polycarbonate polyol turning to a monomer unit for the urethane prepolymer (a1),
- the main agent (A) further containing, in addition to the urethane prepolymer (a1), a residual polyisocyanate (a2) which is a remainder of the raw material polyisocyanate that did not react with the polycarbonate polyol, and
- an equivalent ratio of an isocyanate group in the main agent (A) to an active hydrogen group in the curing agent (B) being from 0.5 to 4.
A two-part curable adhesive composition comprising a main agent (A) containing a urethane prepolymer (a1), and a curing agent (B) containing a polyol compound (b1) and a polyamine compound (b2),
- the urethane prepolymer (a1) being made by reacting a raw material polyisocyanate and a polycarbonate polyol in an equivalent ratio of an isocyanate group in the raw material polyisocyanate to a hydroxy group in the polycarbonate polyol, the equivalent ratio being adjusted such that a cured product obtained by curing the two-part curable adhesive composition has a tensile strength of 15 MPa or greater and an elongation at break of 150% or greater in accordance with JIS K6251, with all of the polycarbonate polyol turning to a monomer unit for the urethane prepolymer (a1),
- the main agent (A) further containing, in addition to the urethane prepolymer (a1), a residual polyisocyanate (a2) that is a remainder of the raw material polyisocyanate that did not react with the polycarbonate polyol, and
- an equivalent ratio of an isocyanate group in the main agent (A) to an active hydrogen group in the curing agent (B) being from 0.5 to 4.
Dependencies are inferred from the claim text.