US 2019/0055438 A1 · HOT MELT ADHESIVE

Abstract

Problem to be solved of the present invention is to provide a hot-melt adhesive agent which is capable of applying at low temperature, has an excellent adhesiveness at low temperature, and a disposable product obtained by employing the hot-melt adhesive agent. Means for solving the problem is a hot-melt adhesive agent comprised of a thermoplastic block copolymer (A) which is a copolymer of vinyl class aromatic hydrocarbons and conjugated diene compounds, wherein the thermoplastic block copolymer (A) comprises a radial type styrene block copolymer having a styrene content of 35 to 45% by weight and a diblock content of 50 to 90% by weight, and having a viscosity at 25° C. as a 25% (by weight) toluene solution of not more than 250 mPa·s (A1).

Claims5

Dependent claims

A disposable product composed by bonding a hot melt adhesive agent with a polyethylene film and at least one member selected from the group consisting of a woven fabric, a nonwoven fabric, a rubber, a resin and papers, wherein the hot melt adhesive agent comprises:

a) 3 to 60 parts by weight of a thermoplastic block copolymer consisting only of a radial styrene-conjugated diene block copolymer having (i) a styrene content of 35 to 45% by weight and a diblock content of 50 to 90% by weight (ii) a viscosity less than 250 mPa·s at 25° C. and 25% by weight in toluene solution;
b) about 60 to about 85 parts by weight of a tackifier;
and
c) about 15 to about 20 parts by weight of an oil;
wherein the conjugated diene compound is selected from the group consisting of 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene and combinations thereof.

2 more elements

Dependencies are inferred from the claim text.

Hot melt adhesive

Life of this patent

Hot melt adhesive

Life of this patent

Abstract

Claims5