Purac Biochem Bv

Henkel Ag & Company, Kgaa

Ingevity UK Ltd.

Kevin Bernardus Braam

Chris François Hubert Schaekens

Gerrit Gobius Du Sart

Rick Jeffrey Van Strien

Remco Johannes Antonius Stevens

Jessie Richarda Anna Verkerk

Chris Francois Schaekens

Jessie Richarda Verkerk

A lactic acid based hot-melt adhesive with an amorphous lactic acid oligomer tackifier. A hot-melt adhesive (HMA) includes: a lactic acid and caprolactone copolymer resin, a crystalline lactic acid oligomer wax, and said amorphous lactic acid oligomer tackifier, characterized in that the amorphous lactic acid oligomer tackifier includes an amorphous polymerisation product of a) lactic acid monomer and b) a multifunctional polymerization initiator containing three or more hydroxy and/or amino groups. The use of the amorphous lactic acid oligomer tackifier in a lactic acid-based hot-melt adhesive, to a method for adhering substrates together using a hot-melt adhesive including said amorphous lactic acid oligomer tackifier, and to a specific amorphous lactic acid oligomer tackifier and a method of its preparation.

Tackifier for lactic acid based hot-melt adhesive

The invention pertains to a non-reactive hot-melt adhesive comprising 10-90 wt. %, calculated on the weight of the adhesive, of amorphous thermoplastic resin which is compatible with polylactic acid, wherein the amorphous thermoplastic resin is a random copolymer of lactic acid and further reactive monomer, 10-90 wt. %, calculated on the weight of the adhesive, of a polylactic acid polymer unit (PLAU) selected from poly-L-lactic acid (PLLAU) and poly-D-lactic acid (PDLAU), the unit having a number average molecular weight of at least 0.75 kg/mol.

Non-reactive hot-melt adhesive with specific resin

A hot-melt adhesive includes a copolymer having first and second blocks, wherein the first block is an amorphous copolymer of lactic acid and a further polymerisable monomer and the second block is a polylactic acid polymer selected from poly-L-lactic acid (PLLA) and poly-D-lactic acid (PDLA), the first block having a number average molecular weight of at least 0.5 kg/mol and the second block having a number average molecular weight of at least 1 kg/mol. Preferably, the hot-melt adhesive also has 0.5-20 wt. %, calculated on the weight of the copolymer of a polylactic acid unit (PLAU) which has a stereochemistry which is opposite to the stereochemistry of the second block in the copolymer. The non-reactive hot-melt adhesive combines a good adhesive performance with storage stability resulting from a low cold-flow. Further, the adhesive is at least partially based on polymers which can be prepared from renewable resources.

Non-reactive hot-melt adhesive with lactide-based copolymer

A non-reactive hot-melt adhesive including 10-90 wt. %, calculated on the weight of the adhesive, of amorphous thermoplastic resin which is compatible with polylactic acid, 10-90 wt. %, calculated on the weight of the adhesive, of a polylactic acid polymer unit (PLAU) selected from poly-L-lactic acid (PLLAU) and poly-D-lactic acid (PDLAU), the unit having a number average molecular weight of at least 0.75 kg/mol, and 0.5-20 wt. %, preferably 1-10 wt. %, calculated on the weight of the first PLAU, of a second polylactic acid polymer unit (PLAU) selected from poly-L-lactic acid (PLLAU) and poly-D-lactic acid (PDLAU), the unit having a number average molecular weight of at least 0.75 kg/mol, wherein when the first PLAU is PLLAU, the second PLAU is PDLAU and when the first PLAU is PDLAU, the second PLAU is PLLAU.

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Gorinchem, Netherlands

Kevin Bernardus Braam