초록 ▼

The hotmelt adhesive preferably has a melt viscosity of 4 to 100 Pa.cndot.s at 170.degree. C. The PU prepolymer has only one Tg in the DSC curve. The hotmelt adhesive is distinguished by high creep resistance and high early and ultimate strengths. Accordingly, it is mainly used in the shoe industry,

The hotmelt adhesive preferably has a melt viscosity of 4 to 100 Pa.cndot.s at 170.degree. C. The PU prepolymer has only one Tg in the DSC curve. The hotmelt adhesive is distinguished by high creep resistance and high early and ultimate strengths. Accordingly, it is mainly used in the shoe industry, more particular, in application machines designed for application in the shoe production line which does not contain any steam-operated preliminary crosslinking stage or a drying tunnel. The hotmelt adhesive is preferably produced by a single-stage process. The adhesive is particularly suitable for fibrous materials, such as leather and textiles.

대표청구항 ▼

[ What is claimed is:] [1.] A moisture-curing polyurethane hotmelt adhesive, which comprises at least one polyurethane prepolymer which is the reaction product of:at least one polyisocyanate;at least one polypropylene glycol which has a molecular weight of about 100 to about 1,000 in a concentration

[ What is claimed is:] [1.] A moisture-curing polyurethane hotmelt adhesive, which comprises at least one polyurethane prepolymer which is the reaction product of:at least one polyisocyanate;at least one polypropylene glycol which has a molecular weight of about 100 to about 1,000 in a concentration of more than 10% by weight, based on the hotmelt adhesive as a whole;at least one polyester glycol; andat least one chain extender.