The present invention provides an optically clear adhesive sheet using a heat-curable polyurethane composition, wherein the optically clear adhesive sheet can, when bonded to an adherend such as a glass plate, prevent the occurrence of air bubbles even at high temperature and normal humidity and maintain a stable bonded interface. The optically clear adhesive sheet of the present invention is an optically clear adhesive sheet containing: a cured product of a heat-curable polyurethane composition, the heat-curable polyurethane composition containing a polyol component and a polyisocyanate component, the polyol component having an olefin skeleton, the polyisocyanate component containing an acyclic aliphatic polyisocyanate and/or an alicyclic polyisocyanate.

The present invention relates to a reactive hot melt adhesive composition, a polyurethane prepolymer composition, and cured reaction product thereof having a high mechanical strength and an excellent bonding strength as well as a better reworkability. In particular, the present invention relates to a reactive hot melt adhesive composition comprising: 10% to 24% by weight of a polyisocyanate, 40% to 73% by weight of a first polyol having a number average molecular weight larger than 1,500 g/mol, 1% to 25% by weight of a (meth)acrylate polymer having a number average molecular weight of 20,000 to 80,000 g/mol, and 1% to 15% by weight of a diluent, in which the weight percentages are based on the total weight of all components of the composition.

The present invention relates to an acrylic resin powder containing a multistage polymer (G) having an alkyl (meth)acrylate ester (ma) monomer unit and an alkyl (meth)acrylate ester (mb) monomer unit, in which an alkyl group in the alkyl (meth)acrylate esters (ma) and (mb) has 4 to 8 carbon atoms, a glass transition temperature of the multistage polymer (G) is 50° C. or higher, a mass average molecular weight is 10,000 or more and 300,000 or less, a softening temperature that is measured by a flow tester temperature-rising method is 150° C. to 200° C., and the acrylic resin powder is soluble in acetone.

The present invention relates to a reactive hot melt adhesive composition and the use thereof. In particular, the present invention provides an adhesive having excellent washing resistance, especially having excellent resistance to antibacterial laundry cleansers. In addition, the adhesive has very short open time and good softness upon curing.

The invention relates to an adhesive film which comprises a layer of an adhesive that comprises one or more polymers and at least one peroxide, characterized in that the adhesive comprises at last 50% by weight of thermoplastic polymers that do not have C═C multiple bonds, in that at least one peroxide has the general structural formula R—O—O—R′, wherein R and R′ each represent organyl groups or together represent a cyclic organyl group, and in that the peroxide in solution has a 1-minute half-life temperature of less than 200° C. In a preferred embodiment, the thermoplastic polymer is a polyurethane and the peroxide is a dicumyl peroxide.

A method of manufacturing at least a part of a footwear in an automatic manufacturing line includes providing a footwear part in the form of a leather base layer, providing a footwear part in the form of a leather attachment layer, automatically stacking the leather base layer and the leather attachment layer against each other with an intermediate application of adhesive between them, automatically activating the adhesive, automatically forcing the leather base layer and the leather attachment layer against each other under a pressure with the adhesive between them, curing the adhesive and thereby bonding the leather base layer and the leather attachment layer to each other thereby providing at least a part of a footwear upper.

A moisture-permeable waterproof fabric includes: a cloth (i), an adhesive layer (ii), and a surface skin layer (iii). The adhesive layer (ii) is formed from a moisture-curable polyurethane hot melt resin composition that contains a urethane prepolymer (C) having an isocyanate group, and the urethane prepolymer (C) is a reaction product of a polyisocyanate (B) and a polyol (A) containing a biomass-derived polyester polyol (a1). The surface skin layer (iii) is formed from a urethane resin composition that contains a urethane resin (R) containing a polyol (P) and a polyisocyanate (Q) as essential raw materials thereof, and the polyol (P) contains a polyol (P1) having an oxyethylene group and a specific polyester polyol (P2).

The present disclosure relates to an elastic hot glue having low processing temperature capability. The elastic hot glue includes a TPU glue layer. The melting point of the TPU glue layer is 60˜100° C. The elastic recovery rate of the TPU glue layer is 95-100%. The elastic hot glue of the present disclosure can be widely applied to low processing temperature. The product using the elastic hot glue of the present disclosure has high elasticity recovery, and strong peeling strength so as to avoid the damage of the product, and increase the life of the product and maintain the appearance of the product.

A polyurethane hot melt adhesive is provided. The polyurethane hot melt adhesive is formed by reacting an isocyanate component, a polyol component, and a chain extender component. The polyol component includes a first polyol and a second polyol, a number-average molecular weight of the first polyol is within a range from 650 to 1,500, and a number-average molecular weight of the second polyol is within a range from 1,500 to 3,000. The chain extender component includes a first chain extender and a second chain extender, and the second chain extender is a diyol having an ether group or a hydrocarbyl. A ratio between a weight percentage of the first chain extender and a weight percentage of the second chain extender is within a range from 9:1 to 4:1. A forming temperature of the polyurethane hot melt adhesive is within a range from 100° C. to 150° C.

Disclosed is a moisture reactive hot melt adhesive composition prepared from a combination comprising a polyisocyanate; a polyol; a MA-SCA acid; one or both of an inorganic filler or an organosilane; optionally a thermoplastic polymer; and optionally one or more additives. Useful polyols include poly(hexanediol adipate), a polyester diol having a structure of Formula 1 or of Formula 2 and combinations thereof. Formula 1 is:

H—[O(CH.sub.2).sub.mOOC(CH.sub.2).sub.nCO].sub.k—O(CH.sub.2).sub.m—OH;

m and n are each an even integer; m+n =8; m and n are each independently selected from 2, 4 or 6; k is an integer from 9 to 55; and the polyol of Formula 1 has a number average molecular weight of about 2,000 to about 11,000. Formula 2, a polycaprolactone polyol, is:

HO—[(CH.sub.2).sub.5COO].sub.p—R.sub.1—[OOC(CH.sub.2).sub.5].sub.1—OH;

R.sub.1 is an initiator such as 1,4′-butanediol, 1,6′-hexanediol, or ethylene glycol; p is an integer from 0 to 96; q is an integer from 0 to 96; p+q=16 to 96; and the polyol has a number average molecular weight of about 2,000 to about 11,000 or less.