Adhesive compositions and the use thereof
AssigneeHenkel IP & Holding GmbH
InventorsJennifer THATCHER, Yuhong HU
Life of this patent
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Abstract
The present invention relates to pressure sensitive hot melt adhesive compositions that comprise greater than about 15 wt % of a metallocene-catalyzed polyolefin random copolymer. The pressure sensitive hot melt adhesive has a heat of fusion less than 1.5 J/g and a peak glass transition temperature from −40° C. to 5° C. Crystallization in the adhesive is inhibited over time, and thus, the adhesive maintains a balance of peel and tack performances, making the adhesive particularly well suited for electronics, medical, industrial, graphics, construction and consumer goods applications.
Claims20
A hot melt pressure sensitive adhesive comprising greater than about 15 wt %, based on the total weight of the adhesive, of a metallocene-catalyzed polyolefin random copolymer;
- wherein the adhesive has (i) a heat of fusion less than 1.5 J/g, measured at 1° C./min heating and cooling rate in accordance with ASTM D3418-12;
- and (ii) a peak glass transition temperature (Tg) from −40° C. to 5° C.
A hot melt pressure sensitive adhesive comprising:
- i. about 10 to about 40 wt % of a metallocene-catalyzed polyolefin random copolymer, which has a heat of fusion less than about 15 J/g measured at 10° C/min heating and cooling rate in accordance with ASTM D3418-12;
- ii. about 40 to about 85 wt % of a tackifier;
- and
- iii. about 1 to about 50 wt % of a plasticizer;
- iv. optionally, an additives;
- and
- wherein the total wt % adds to 100%;
- wherein the adhesive has (a) a heat of fusion less than 1.5 J/g, measured at 1° C./min heating and cooling rate in accordance with ASTM D3418-12;
- (b) a peak glass transition temperature from −40° C. to 5° C., and (c) a storage modulus, at 25° C., of less than 5×104 Pascal.
A hot melt pressure sensitive adhesive comprising greater than 15 wt %, based on the total weight of the adhesive, of a metallocene-catalyzed polyolefin random copolymer;
- wherein the adhesive has (i) a heat of fusion less than 1.5 J/g measured at 1° C./min heating and cooling rate in accordance with ASTM D3418-12;
- (ii) a peak glass transition temperature from −40° C. to 5° C.;
- (iii) a peel force of at least 150 gf/in on a cotton fabric substrate in accordance with cotton peel method at 25 gsm add-on level;
- and (iv) an aged peel force after 10 weeks at 40° C. of at least 100 gf/in on a cotton fabric substrate in accordance with cotton peel method at 25 gsm add-on level.
Dependencies are inferred from the claim text.