Anti-environmental stress cracking additive, compositions and methods thereof

Patent metadata

Field	Value
Publication number	US-12534613-B2
Application number	US-202117565002-A
Country	US
Kind code	B2
Filing date	Dec 29, 2021
Priority date	Dec 29, 2020
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

An anti-environmental stress cracking additive particle, wherein the particle may include an anti-environmental stress cracking active phase, a support phase, and a compatibilizing phase, and wherein the particles have an average size of up to 200 μm. Processes for preparing the anti-environmental stress cracking additive may include a solvent/non-solvent process, a free non-solvent process, and solid state methods. A polymer composition may include a matrix polymer and the anti-environmental stress cracking additive. An article may comprise the polymer composition comprising the anti-environmental stress cracking additive particle.

First claim

What is claimed:

1 . An anti-environmental stress cracking (ESC) additive powder, comprising:
an environmental stress cracking (ESC) active phase, the ESC-active phase being a polymer phase comprising one or more polar polymers or non-polar polymers, and a solid support phase comprising an organic or inorganic particle.

2 . The anti-ESC additive of claim 1 , further comprising:
a compatibilizing phase on a surface of the ESC-active phase, having a compatibilizing agent selected from organic acids, anhydrides of organic acids, amides of organic acids, salts of organic acids, epoxies, silanes, ionomers, and any combinations thereof.

3 . The anti-ESC additive of claim 1 , wherein the ESC-active phase comprises a polar polymer.

4 . The anti-ESC additive of claim 3 , wherein the polar polymer is a polymer containing hydroxyl, carboxylic acid, carboxylate, ester, ether, acetate, amide, amine, epoxy, imide, imine, sulfone, or phosphone groups, or their derivatives.

5 . The anti-ESC additive of claim 3 , wherein the polar polymer is a water-insoluble polar polymer, wherein the water-insoluble polar polymer is selected from polymers containing carboxylic acid, carboxylate, ester, ether, acetate, amide, amine, epoxy, imide, imine, sulfone, phosphone, and any derivatives of the aforementioned groups.

6 . The anti-ESC additive of claim 3 , wherein the polar polymer is a water-soluble polar polymer, wherein the water-soluble polar polymer is selected from polymers containing poly(vinyl alcohol) (PVA), chitosan, gelatin, dextran, poly(lactic acid), poly(ethylene glycol), cellulose microfibrils, cyclodextrin, poly(ε-caprolactone), carboxymethyl cellulose, n-vinylcaprolactam, poly(ethylene glycol)methyl ether, cellulose nanofiber, poly(ethylene glycol) methacrylate, poly((propylene glycol) methacrylate), and poly(vinyl methyl ether).

7 . The anti-ESC additive of claim 3 , wherein the polar polymer is a polymer hydrogel.

8 . The anti-ESC additive of claim 3 , wherein the polar polymer is crosslinked.

9 . The anti-ESC additive of claim 1 , wherein the solid support is present in an amount ranging from 0.1 to 99.9 wt % of the anti-ESC additive powder.

10 . The anti-ESC additive of claim 1 , wherein the anti-ESC additive powder has an average particle size of less than 200 μm.

11 . The anti-ESC additive of claim 1 , wherein the ESC-active phase is present in an amount ranging from 0.1 to 99.9 wt % of the anti-ESC additive.

12 . A polymer composition, comprising:
a matrix polymer; and an anti-ESC additive powder of claim 1 .

13 . The polymer composition of claim 12 , wherein the anti-ESC additive powder further comprises a compatibilizing phase on a surface of the ESC-active phase.

14 . The polymer composition of claim 12 , further comprising: a compatibilizing agent dispersed in the polymer composition.

15 . The polymer composition of claim 12 , wherein the anti-ESC additive powder is a rigid particle having a stiffness that is at least that of the matrix polymer.

16 . The polymer composition of claim 12 , wherein the polymer composition has a stiffness loss rate less than 100 MPa/% (w/w) measured by the slope of the linear fitting curve of the flexural modulus resistance against anti-ESC additive amount (% w/w) using a concentration range from 0 to 10 (% w/w), wherein the flexural modulus is measured according to ASTM D790, procedure B, at room temperature, using the secant modulus at 1% strain calculus.

17 . The polymer composition of claim 12 , wherein the polymer composition exhibits:
i) an anti-ESC standard efficiency rate of a minimum of 0.01 obtained by a Bell test, performed according to ASTM D1693-15, or ii) an anti-ESC additive pure efficiency rate of a minimum of 0.01 obtained by Ohde-Okamoto test, or iii) an anti-ESC additive intrinsic efficiency rate improvement of greater than 10% measured by a notched specimen in a creep test configuration, a temperature of 50° C., and using two different media, a neutral medium and an active medium.

18 . The polymer composition of claim 12 , wherein the anti-ESC additive is present in an amount up to 10 wt % of the polymer composition.

19 . The polymer composition of claim 12 , wherein the matrix polymer is a polyolefin.

20 . An article, comprising the polymer composition of claim 12 .

Assignees

• Braskem Sa

Inventors

• Bueno Marcos Roberto Paulino

Classifications

• C08L2312/00

  Crosslinking · CPC title

• C08L2205/22

  Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer · CPC title

• C08L2205/08

  containing additives to improve the compatibility between two polymers · CPC title

• C08J2329/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C08K5/09

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