Rosin modified acrylic emulsion for liquid barrier coating compositions

Patent metadata

Field	Value
Publication number	US-2025051490-A1
Application number	US-202218718453-A
Country	US
Kind code	A1
Filing date	Dec 15, 2022
Priority date	Dec 16, 2021
Publication date	Feb 13, 2025
Grant date	—

Abstract

The present disclosure provides a method of making a styrene-free polymer emulsion comprising at least one resin, wherein said resin is derived from a biorenewable source. The aqueous emulsions of the present disclosure are suitable for use in coatings.

First claim

1 .- 19 . (canceled)

20 . A method of making a polymer emulsion comprising:
i) providing a resin dispersion comprising at least one resin in an aqueous solution; ii) adding at least one polymer seed and a polymerization mixture to the resin dispersion, the polymerization mixture comprising at least one co-polymerizable monomer; and iii) preparing a polymer emulsion in water by radical emulsion polymerization of the polymerization mixture, the resin dispersion and the polymer seed.

21 . The method of claim 20 , wherein the at least one resin is derived from a biorenewable source.

22 . The method of claim 20 , wherein the at least one resin comprises a rosin ester.

23 . The method of claim 20 , wherein the at least one resin comprises a fumarate ester.

24 . The method of claim 20 , wherein the at least one resin has an acid value of from 125 mg KOH/g to 200 mg KOH/g.

25 . The method of claim 20 , wherein the at least one resin has a number average molecular weight (Mn) of from 600 g/mol to 800 g/mol, and a weight average molecular weight (Mw) of from 1500 g/mol to 15,000 g/mol.

26 . The method of claim 20 , wherein the emulsion polymerization monomers are added as two separate feeds, Feed 1 and Feed 2.

27 . The method of claim 26 , wherein the T g of Feed 1 is from −25° C. to −15° C., as measured by ASTM D3418-15.

28 . The method of claim 26 , wherein the T g of Feed 2 is from 20° C. to 40° C., as measured by ASTM D3418-15.

29 . The method of claim 20 , wherein the monomers are selected from the group consisting of methyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, i-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (meth)acrylic acid, itaconic acid, and combinations thereof.

30 . The method of claim 20 , further comprising an initiator.

31 . The method of claim 30 , wherein the initiator is a redox initiator.

32 . The method of claim 30 , wherein the initiator is selected from the group consisting of isoascorbic acid (IAA), t-butyl hydroperoxide (TBHP), and a combination thereof.

33 . The method of claim 20 , further comprising a catalyst.

34 . The method of claim 33 , wherein the catalyst comprises copper (II) sulfate (CuSO 4 ).

35 . A polymer emulsion obtained by the method according to claim 20 , wherein the polymer emulsion is substantially free of styrene.

36 . An aqueous composition comprising the polymer emulsion of claim 20 .

37 . A coating, comprising the aqueous composition of claim 36 and a substrate.

38 . The coating of claim 37 , wherein the substrate is selected from the group consisting of paper, paperboard, and cardboard.

Assignees

• Basf Se

Inventors

• Leman Titus David
• Deeter Gary

Classifications

• D21H19/20

  comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C08K5/14

  Peroxides · CPC title

• C08K5/103

  with polyalcohols · CPC title

• C08F20/18

  with acrylic or methacrylic acids · CPC title

• C08F4/30

  Inorganic compounds · CPC title