US 11,981,842 B2
Tackifier for lactic acid based hot-melt adhesive
Kevin Bernardus Braam, Gorinchem (NL); Chris Francois Hubert Schaekens, Gorinchem (NL); Rick Jeffrey Van Strien, Gorinchem (NL); and Remco Johannes Antonius Stevens, Gorinchem (NL)
Assigned to PURAC BIOCHEM B.V., Gorinchem (NL); HENKEL AG & CO. KGAA, Duesseldorf (DE); and INGEVITY UK LTD., Warrington (GB)
Appl. No. 17/265,298
Filed by PURAC BIOCHEM B.V., Gorinchem (NL); HENKEL AG & CO. KGAA, Duesseldorf (DE); and INGEVITY UK LTD., Warrington (GB)
PCT Filed Dec. 18, 2019, PCT No. PCT/EP2019/086006
§ 371(c)(1), (2) Date Feb. 2, 2021,
PCT Pub. No. WO2020/127521, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18215059 (EP), filed on Dec. 21, 2018.
Prior Publication US 2021/0348035 A1, Nov. 11, 2021
Int. Cl. C09J 7/35 (2018.01); C08G 63/08 (2006.01); C08G 81/00 (2006.01); C08K 5/053 (2006.01); C09J 11/06 (2006.01); C09J 11/08 (2006.01); C09J 167/04 (2006.01)
CPC C09J 7/35 (2018.01) [C08G 63/08 (2013.01); C08G 81/00 (2013.01); C08K 5/053 (2013.01); C09J 11/06 (2013.01); C09J 11/08 (2013.01); C09J 167/04 (2013.01); C08G 2170/20 (2013.01); C08G 2390/00 (2013.01); C09J 2301/304 (2020.08); C09J 2301/408 (2020.08); C09J 2301/414 (2020.08); C09J 2453/00 (2013.01); C09J 2467/00 (2013.01)] 14 Claims
 
1. A hot-melt adhesive (HMA) comprising:
a lactic acid and caprolactone copolymer resin,
a crystalline lactic acid oligomer wax, and
an amorphous lactic acid oligomer tackifier,
wherein the amorphous lactic acid oligomer tackifier has a crystallinity as defined by its enthalpy of melting of at most 2.5 J/g and comprises an amorphous polymerisation product of a) lactic acid monomer and b) a multifunctional polymerization initiator containing three or more hydroxy and/or amino groups, wherein the amorphous polymerisation product of the amorphous lactic acid oligomer tackifier has a number average molecular weight (Mn) of 1000 to 10000 g/mol.