Hot melt adhesive composition for bookbinding

Patent metadata

Field	Value
Publication number	US-2016376479-A1
Application number	US-201615260777-A
Country	US
Kind code	A1
Filing date	Sep 9, 2016
Priority date	Mar 10, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

The present invention provides a hot melt adhesive composition for bookbinding comprising a base polymer, a wax and/or an oil, a tackifier, a stabilizer and optionally a filler; wherein the base polymer comprises a propylene-based elastomer, an amorphous poly-α-olefin (APAO), and optionally, an ethylene-based or propylene-based plastomer.

First claim

1 . A hot melt adhesive composition comprising, a base polymer, a wax and/or an oil, a tackifier, a stabilizer and optionally a filler; wherein the base polymer comprises a propylene-based elastomer, an amorphous poly-α-olefin (APAO), and optionally, an ethylene-based or propylene-based plastomer;
wherein the ethylene-based or propylene-based plastomer has a MFR of more than 20 g/10 min, measured at 230° C./2.16 kg according to ASTM D1238; a density of greater than 0.865 g/m 3 , measured according to ASTM D1505; and a enthalpy of fusion of more than 10 J/g, measured by Differential Scanning Calorimetry.

2 . The hot melt adhesive composition according to claim 1 , wherein the elastomer has a Melt Flow Rate (MFR) of below 100 g/10 min, measured at 230° C./2.16 kg according to ASTM D1238; a density of no more than 0.865 g/m 3 measured according to ASTM D1505, and a enthalpy of fusion of less than 10 J/g, measured by Differential Scanning Calorimetry. 3 (currently amended): The hot melt adhesive composition according to claim 1 , wherein the amorphous poly-α-olefin has a weight average molecular weight of no less than 1,000 g/mol, and a Brookfield viscosity at 180° C. of no less than 1000 cps.

4 . The hot melt adhesive composition according to claim 1 , wherein the ethylene-based or propylene-based plastomer has a MFR of 30 g/10 min to 1000 g/10 min, measured at 230° C./2.16 kg according to ASTM D1238; a density of 0.865 to 1.0 g/m 3 , measured according to ASTM D1505; and a enthalpy of fusion of more than 15 J/g, measured by Differential Scanning Calorimetry.

5 . The hot melt adhesive composition according to 1 , wherein the propylene-based elastomer is a copolymer of propylene with one or more comonomers selected from ethylene, butene, hexylene and octene or a combination thereof.

6 . The hot melt adhesive composition according to claim 1 , wherein the ethylene-based plastomer is a copolymer of ethylene with one or more comonomers selected from propylene, butene, hexylene and octene or a combination thereof, and the propylene-based plastomer is a copolymer of propylene with one or more comonomers selected from ethylene, butene, hexylene and octene or a combination thereof.

7 . The hot melt adhesive composition according to claim 1 , wherein the APAO is a homopolymer of propylene or a copolymer of propylene with one or more α-olefinic comonomers selected from ethylene, 1-butane, 1-hexane and 1-octene or a combination thereof.

8 . The hot melt adhesive composition according to claim 1 , wherein the elastomer is a metallocene-catalyzed elastomer and/or the plastomer is a metallocene-catalyzed plastomer.

9 . The hot melt adhesive composition according to claim 1 , wherein the propylene-based elastomer is present in the composition in an amount of 2 to 30 wt. %, based on the total weight of the composition.

10 . The hot melt adhesive composition according to claim 1 , wherein the amorphous poly-α-olefin is present in the composition in an amount of 10 to 50 wt. %, based on the total weight of the composition.

11 . The hot melt adhesive composition according to claim 1 , wherein the ethylene-based or propylene-based plastomer is present in the composition in an amount of 1 to 25 wt. %, based on the total weight of the composition.

12 . The hot melt adhesive composition according to claim 1 , wherein the wax is selected from microcrystalline waxes, polyethylene waxes, Fischer-Tropsch waxes, paraffin waxes and polypropylene waxes or a combination thereof.

13 . The hot melt adhesive composition according to claim 1 , wherein the oil is selected from hydrotreated heavy naphthenic petroleum oils and paraffinic oils or a combination thereof.

14 . The hot melt adhesive composition according to claim 1 , wherein the wax and/or the oil is present in the composition in an amount of 1 to 40 wt. %, based on the total weight of the composition.

15 . The hot melt adhesive composition according to claim 1 , wherein the tackifier is present in the composition in an amount of 10 to 50 wt. %, based on the total weight of the composition.

16 . A book comprising the hot melt adhesive composition according to claim 1 .

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Bao Huimin
• Low Yew-Guan

Classifications

• C09J123/14 Primary

  Copolymers of propene (C09J123/16 takes precedence) · CPC title

• C09J123/16 Primary

  Elastomeric} ethylene-propylene or ethylene-propylene-diene copolymers {, e.g. EPR and EPDM rubbers · CPC title

• C09J157/02

  Copolymers of mineral oil hydrocarbons · CPC title

• B42C9/0006

  by applying adhesive to a stack of sheets · CPC title

• C08L2314/06

  Metallocene or single site catalysts · CPC title