As a pressure-sensitive adhesive polarizing plate, for example, a pressure-sensitive adhesive polarizing plate allowing a pressure-sensitive adhesive layer in the polarizing plate to have an excellent interfacial adhesion with another layer and have no detachment phenomenon can be provided in the present application.

Disclosed is a urethane adhesive comprising a urethane resin obtained by blending a polyol with an isocyanate compound; a plasticizer; and a stabilizing agent, wherein the polyol comprises a polyether polyol, and the plasticizer comprises a castor oil based compound. Releasability of the adhesive does not degrade even though the adhesive is kept under a severe condition such as at a high temperature and at a high humidity, and the adhesive is excellent in compatibility with regard to the plasticizer and the stabilizing agent. Since the urethane adhesive is excellent in releasability with regard to a glass plate, a polarizer for liquid crystal displays and so on, it is useful as an adhesive for surface protective films which are used for windowpanes, mobile phones and the like.

Disclosed is a urethane adhesive comprising a urethane resin obtained by blending a polyol with an isocyanate compound; a plasticizer; and a stabilizing agent, wherein the polyol comprises a polyether polyol, and the plasticizer comprises a castor oil based compound. Releasability of the adhesive does not degrade even though the adhesive is kept under a severe condition such as at a high temperature and at a high humidity, and the adhesive is excellent in compatibility with regard to the plasticizer and the stabilizing agent. Since the urethane adhesive is excellent in releasability with regard to a glass plate, a polarizer for liquid crystal displays and so on, it is useful as an adhesive for surface protective films which are used for windowpanes, mobile phones and the like.

An adhesive includes: a urethane prepolymer (A) obtained by reacting a polyol (a) with a polyisocyanate (b) under such conditions that the molar ratio of NCO/OH is 0.5-0.9 and having a molecular-weight dispersion degree [(weight-average molecular weight (Mw))/(number-average molecular weight (Mn)); hereinafter referred to also as Mw/Mn] of 4-12; a polyfunctional polyol (B), and an isocyanate curing agent (C).

An adhesive includes: a urethane prepolymer (A) obtained by reacting a polyol (a) with a polyisocyanate (b) under such conditions that the molar ratio of NCO/OH is 0.5-0.9 and having a molecular-weight dispersion degree [(weight-average molecular weight (Mw))/(number-average molecular weight (Mn)); hereinafter referred to also as Mw/Mn] of 4-12; a polyfunctional polyol (B), and an isocyanate curing agent (C).

A compound applicable to various uses can be provided in the present application. In one embodiment, the compound can be included in a cross-linkable composition to serve as a crosslinking rate regulator. In another embodiment, the compound can be applied to a cross-linkable composition such that a membrane formed by the cross-linkable composition has excellent interfacial adhesion with another membrane, and also prevent the occurrence of leakage of the membrane formed by the cross-linkable composition.

A blocked polyisocyanate composition containing a blocked polyisocyanate obtained from a polyisocyanate and at least one blocking agent, wherein the blocking agent contains a compound represented by general formula (I) shown below, and the amount of methane tetracarbonyl structures represented by general formula (II) shown below, relative to the total molar amount within the blocked polyisocyanate of bonded structures in which the compound represented by general formula (I) is bonded to the polyisocyanate, is at least 0.5 mol % but not more than 10 mol %.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filler, the base resin contains a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the porous filler contains SiO.sub.2 in an amount of 50 mass % or more as a constituent component.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filer, the base resin contains a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition containing a urethane polyol as a polyol component, the porous filler contains SiO.sub.2 in an amount of 50 mass % or more as a constituent component, and a loss tangent (tan ) of the outermost layer of the paint film measured with a dynamic viscoelasticity measuring apparatus under following conditions has a peak temperature in a range of from 40 C. to 40 C.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filer, the base resin contains a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition containing a urethane polyol as a polyol component, the porous filler contains SiO.sub.2 in an amount of 50 mass % or more as a constituent component, and a loss tangent (tan ) of the outermost layer of the paint film measured with a dynamic viscoelasticity measuring apparatus under following conditions has a peak temperature in a range of from 40 C. to 40 C.