Tackifier and a continuous process for producing the tackifier

Patent metadata

Field	Value
Publication number	US-10544335-B2
Application number	US-201415522431-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Oct 31, 2014
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A rosin dispersion is a reaction product of, by dry weight based on total dry weight of the rosin dispersion, from 80% to 98% a rosin resin, and from 2% to 20% a dispersant. The rosin resin is processed by at least one method of a) modification, b) hydrogenation or disproportionation, and c) polymerization or esterification from raw material rosins. The dispersant is selected from C18-C32 aliphatic carboxylic acids, olefin (meth) acrylic acid copolymers, and other acid/anhydride modified polymers. A continuous process for preparing the rosin dispersion and an adhesive formulation comprising the rosin dispersion are also included.

First claim

What is claimed is:

1. A rosin dispersion which is a reaction product of, by dry weight based on total dry weight of the rosin dispersion, from 80% to 98% a rosin resin, and from 2% to 20% a dispersant, wherein the rosin resin is processed by at least one method of a) modification, b) hydrogenation or disproportionation, and c) polymerization or esterification from raw material rosins, and the dispersant is selected from C 18 -C 32 aliphatic carboxylic acids, olefin (meth)acrylic acid copolymers, and other acid/anhydride modified polymers, wherein the rosin resin has an acid value of from 1 to 50 KOH mg/g, and a softening point of from 25 to 150° C.

2. A rosin dispersion which is a reaction product of, by dry weight based on total dry weight of the rosin dispersion, from 80% to 98%, a rosin resin, and from 2% to 20%, a dispersant, wherein the rosin resin is processed by at least one method of a) modification, b) hydrogenation or disproportionation, and c) polymerization or esterification from raw material rosins, and the dispersant is selected from olefin (meth)acrylic acid copolymers, and other acid/anhydride modified polymers.

3. The rosin dispersion according to claim 2 wherein the rosin resin is from 85% to 95% by dry weight based on total dry weight of the rosin dispersion.

4. The rosin dispersion according to claim 2 wherein the rosin resin is from 88% to 93% by dry weight based on total dry weight of the rosin dispersion.

5. The rosin dispersion according to claim 1 wherein the rosin resins are disproportionated rosin esters.

6. The rosin dispersion according to claim 1 wherein the dispersants are olefin (meth)acrylic acid copolymers.

7. The rosin dispersion according to claim 1 wherein the dispersants are ethylene-acrylic acid copolymers.

8. A continuous process for preparing the rosin dispersion according to claim 1 comprising the steps of merging into a mechanical disperser a stream of a molten disperse phase with a stream of a molten continuous phase; wherein the molten disperse phase comprises the rosin resin, and the molten continuous phase comprises water; and the dispersant is added to either the disperse phase, the continuous phase, or both.

9. The continuous process according to claim 8 wherein the continuous process is an extrusion process.

10. An adhesive formulation comprising an acrylic polymer emulsion and by dry weight based on total dry weight of the acrylic polymer emulsion, from 1% to 50%, the rosin dispersion according to claim 1 .

11. The adhesive formulation according to claim 10 wherein the acrylic polymer emulsion has a glass transition temperature of from −90 to 0° C., and a weight average molecular weight of from 100,000 to 1,000,000.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Yang Miao
• Gu Weichao
• Qu Zhaohui
• Liang Yongfu

Classifications

• C09J133/02 Primary

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C09J193/04

  Rosin · CPC title

• C08K5/09

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title

• C09J11/08 Primary

  Macromolecular additives · CPC title

• C08L93/04 Primary

  Rosin · CPC title