Solventless Adhesive Composition Process and Laminate with Same

Patent metadata

Field	Value
Publication number	US-2022010183-A1
Application number	US-201817294022-A
Country	US
Kind code	A1
Filing date	Nov 16, 2018
Priority date	Nov 16, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

A process comprises (i) providing an isocyanate component A that is a reaction product of an aliphatic polyisocyanate, an aromatic polyisocyanate, an aliphatic polyester polyol, and a polyether polyol; (ii) providing a polyol component B comprising an aliphatic polyester polyol and a polyether polyol; (iii) mixing A and B to form a solventless adhesive (SLA) composition component A and component B each comprises an aliphatic polyester polyol having a viscosity from 800 to 6000 mPa·s at 25° C. and a hydroxyl number from 60 to 180 mg KOH/g; the SLA composition has (a) an initial viscosity at 40° C. from 500 to 1600 mPa·s, (b) an increasing viscosity ratio from 100% to 112% of the initial viscosity after the SLA composition stands at 40° C. for 10 min, and (c) an end viscosity at 40° C. from 120% to 210% of the initial viscosity at 40 min after forming the SLA composition.

First claim

1 . A process comprising:
(i) providing an isocyanate component A that is a reaction product of an aliphatic polyisocyanate, an aromatic polyisocyanate, an aliphatic polyester polyol, and a polyether polyol; (ii) providing a polyol component B comprising an aliphatic polyester polyol and a polyether polyol; component A and component B each comprising an aliphatic polyester polyol having a viscosity from 800 to 6000 mPa·s at 25° C. and a hydroxyl number from 60 to 180 mg KOH/g; (iii) mixing component A and component B to form a solventless adhesive (SLA) composition, the SLA composition having;
(a) an initial viscosity at 40° C. from 500 to 1600 mPa·s,
(b) an increasing viscosity ratio from 100% to 112% of the initial viscosity after the SLA composition stands at 40° C. for 10 min, and
(c) an end viscosity at 40° C. from 120% to 210% of the initial viscosity at a time 40 min after forming the SLA composition.

2 . The process according to claim 1 , comprising
(iv) applying the SLA composition to a first film at a lamination speed from 80 m/min to 600 m/min to form an adhesive applied film; (v) bonding the adhesive applied film to a second film at the lamination speed from 80 m/min to 600 m/min to form an uncured laminate; and (vi) curing the uncured laminate to form a laminate product.

3 . The process of claim 2 comprising
providing a component A having from 15 wt % to 45 wt % of the aliphatic polyester, based on a total weight of component A; and
providing a component B having from 30 wt % to 80 wt % of the aliphatic polyester polyol, based on a total weight of component B;
wherein the aliphatic polyester polyol of component A is the same as the aliphatic polyester polyol of component B.

4 . The process of claim 3 comprising providing a component A having from 8 wt % to 45 wt % of the aliphatic polyisocyanate and from 30 wt % to 60 wt % of the aromatic polyisocyanate, based on a total weight of component A.

5 . The process of claim 4 , comprising forming a laminate product having a property selected from the group consisting of no spots, no white dots, and combinations thereof.

6 . A solventless adhesive (SLA) composition comprising:
an isocyanate component A that is a reaction product of an aliphatic polyisocyanate, an aromatic polyisocyanate, an aliphatic polyester polyol, and a polyether polyol; a polyol component B comprising an aliphatic polyester polyol and a polyether polyol; component A and component B each comprising an aliphatic polyester polyol having a viscosity from 800 to 6000 mPa·s at 25° C. and a hydroxyl number from 60 to 180 mg KOH/g, the SLA composition having; (a) an initial viscosity at 40° C. from 500 to 1600 mPa·s, (b) an increasing viscosity ratio from 100% to 112% of the initial viscosity after the SLA composition stands at 40° C. for 10 min, and (c) an end viscosity at 40° C. from 120% to 210% of the initial viscosity at a time 40 min after forming the SLA composition.

7 . The composition according to claim 6 , wherein the aliphatic polyisocyanate is present in an amount from 8 wt % to 45 wt % and the aromatic polyisocyanate is present in an amount from 30 wt % to 60 wt % based on a total weight of component A.

8 . The composition of claim 6 , wherein the aliphatic polyester polyol in component A is present in an amount from 15 wt % to 45 wt % based on a total weight of component A and the aliphatic polyester polyol in component B is present in an amount from 30 wt % to 80 wt % based on a total weight of component B, and
wherein the aliphatic polyester polyol of component A is the same as the aliphatic polyester polyol of component B.

9 . The composition of claim 6 , wherein component B further comprises a low molecular weight diol or a low molecular weight triol.

10 . A laminate product comprising:
a first film layer; a second film layer; and a solventless adhesive (SLA) layer between the first film layer and the second film layer, the SLA layer comprising; an isocyanate component A that is a reaction product of an aliphatic polyisocyanate, an aromatic polyisocyanate, an aliphatic polyester polyol, and a polyether polyol; a polyol component B comprising an aliphatic polyester polyol and a polyether polyol; component A and component B each comprising an aliphatic polyester polyol having a viscosity from 800 to 6000 mPa·s at 25° C. and a hydroxyl number from 60 to 180 mg KOH/g, the SLA layer having (a) an initial viscosity at 40° C. from 500 to 1600 mPa·s, (b) an increasing viscosity ratio from 100% to 112% of the initial viscosity after the SLA composition stands at 40° C. for 10 min, and (c) an end viscosity at 40° C. from 120% to 210% of the initial viscosity at a time 40 min after forming the SLA composition.

11 . The laminate product according to claim 10 , wherein the aliphatic polyisocyanate is present in an amount from 8 wt % to 45 wt % and the aromatic polyisocyanate is present in an amount from 30 wt % to 60 wt % based on a total weight of component A.

12 . The laminate product according to claim 10 , wherein the aliphatic polyester polyol in component A is present in an amount from 15 wt % to 45 wt % based on a total weight of component A and an amount of the aliphatic polyester polyol in component B is present in an amount from 30 wt % to 80 wt % based on a total weight of component B.

13 . The laminate product according to claim 10 , the laminate product having a property selected from the group consisting of no spots, no white dots, and combinations thereof.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Bai Chenyan
• Hablot Elodie
• Chen Gaobing
• Schmidt Thorsten
• Barretto Abraham

Classifications

• C08G18/792

  formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates · CPC title

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C09J175/08

  from polyethers · CPC title

• C08G18/6644

  having at least three hydroxy groups · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title