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US 11,299,657 B2Granted
Polyolefin-based hot melt adhesives with improved properties
AssigneeBostik SA
InventorsSteven Daniel Gray, Miao Hu
Life of this patent
Estimating the term…
Abstract
A hot melt adhesive composition made from polypropylene copolymer or polypropylene impact copolymer, a polyolefin elastomer, a low density polyethylene, a tackifying resin, a plasticizer, and a nucleating agent. These adhesives are fast setting yet show an improved balance of mechanical properties making them useful for hygiene, construction, and packaging applications.
Claims19
A hot melt adhesive composition, comprising a blend of the following components:
- about 2% to about 20% of a polypropylene random copolymer having a melt flow rate of between about 10 and about 250 g/10 min according to ASTM D-1238 using a temperature of 230° C. and a 2.16 kg weight or mixtures thereof, wherein the comonomer is selected from the group consisting of ethylene and a 1-alkene;
- about 2.5% to about 20% by weight of an olefin based elastomer or a mixture of said olefin based elastomers, wherein the polypropylene random copolymer has a higher crystallinity than the olefin based elastomer;
- about 2.5% to 20% by weight of a linear low density polyethylene or mixture of linear low density polyethylenes, wherein said linear low density polyethylene has a melt index value of from about 100 to about 1000 g/10 min (190° C./2.16 kg) and a density less than 0.94 g/cc as determined by the method described in ASTM D792-00;
- about 0.05 to about 5.0% by weight of a polyolefin nucleating agent comprising dibenzylidene sorbitol derivatives;
- about 10% to about 70% by weight of tackifying resin having a softening point of at least about 80° C. and up to about 140° C.;
- about 24.6% to about 60% by weight of a plasticizer;
- about 0.1% to about 5% of a stabilizer or antioxidant;
- and wherein the components total 100% by weight of the composition, the viscosity of the composition is equal to or less than about 20,000 cP at 163° C. and the tan-delta at 75° C. of the composition is from 0.2 to 0.3.
5 more elements
A hot melt adhesive composition, comprising a blend of the following components:
- about 2% to about 20% of a polypropylene random copolymer having a melt flow rate of between about 10 and about 250 g/10 min according to ASTM D-1238 using a temperature of 230° C. and a 2.16 kg weight or mixtures thereof, wherein the comonomer is ethylene and the polypropylene random copolymer consists of a semi-crystalline phase comprising polypropylene homopolymer and rubbery phase comprising ethylene-propylene copolymer;
- about 2.5% to about 20% by weight of an olefin based elastomer or a mixture of said olefin based elastomers, wherein the polypropylene random copolymer has a higher crystallinity than the olefin based elastomer;
- about 2.5% to 20% by weight of a linear low density polyethylene or mixture of linear low density polyethylenes, wherein said linear low density polyethylene has a melt index value of from about 100 to about 1000 g/10 min (190° C./2.16 kg) and a density less than 0.94 g/cc as determined by the method described in ASTM D792-00;
- about 0.05 to about 5.0% by weight of a polyolefin nucleating agent comprising dibenzylidene sorbitol derivatives;
- about 10% to about 70% by weight of tackifying resin having a softening point of at least about 80° C. and up to about 140° C.;
- about 24.6% to about 60% by weight of a plasticizer;
- about 0.1% to about 5% of a stabilizer or antioxidant;
- and wherein the components total 100% by weight of the composition, the viscosity of the composition is equal to or less than about 20,000 cP at 163° C.
5 more elements
Dependencies are inferred from the claim text.