Formulation of novolak resins for enhancing the acid resistance of polyamide compositions

Patent metadata

Field	Value
Publication number	US-2017190901-A1
Application number	US-201715463895-A
Country	US
Kind code	A1
Filing date	Mar 20, 2017
Priority date	Aug 25, 2008
Publication date	Jul 6, 2017
Grant date	—

Abstract

Novolak resins ere incorporated for enhancing the acid resistance of polyamide compositions. Polyamide compositions containing such novolak resins are useful for producing various plastic shaped articles, such as calibrated particles or injection-molded parts, and are particularly useful for the recovery of sludge, liquids, and gases present in underground reservoirs, especially in the field of hydrocarbon extraction such as crude oil or natural gas.

First claim

1 . A method for increasing the acid resistance of a polyamide composition, comprising: adding a novolac resin comprising a condensation product of a phenolic compound with an aldehyde or a ketone to the polyamide composition for increasing the acid resistance of a polyamide composition.

2 . The method as claimed in claim 1 , characterized in that the polyamide is selected from the group consisting of the polyamide PA-6, the polyamide PA-6,6, the polyamide PA-6,10, the polyamide PA-11, the polyamide PA-12, the polyamide PA-6,12, poly (meta-xylylene adipamide), the polyamide PA-6,6/6,T, the polyamide PA-6,6/,6,1, and blends and copolyamides.

3 . The method as claimed in claim 1 , characterized in that said composition comprises from 40 to 90% by weight of polyamide, relative to the total weight of the composition.

4 . The method as claimed in claim 1 , characterized in that the composition comprises from 5 to 40% by weight of novolac resin, relative to the total weight of the composition.

5 . The method as claimed in claim 4 , characterized in that the novolac resin has a degree of condensation between 2 and 15.

6 . The method as claimed in claim 5 , characterized in that the novolac resin is a condensation product of phenol and formaldehyde.

7 . The method as claimed in claim 6 , characterized in that the novolac resin has a molecular weight between 500 and 3000 g/mol, preferably between 800 and 2000 g/mol.

8 . The method as claimed in claim 3 , characterized in that the polyamide composition comprises at least one reinforcing and/or bulking filler, selected from the group consisting of glass fibers, carbon fibers, aramid fibers, clays, kaolin, mica, wollastonite, silica, talc, graphite, silicon carbide and nanoparticles.

9 . The method as claimed in claim 1 , further comprising: using, the polyamide composition as a filter in the field of the recovery of muds, liquids and gases present in underground reservoirs.

10 . A calibrated particle having a mean particle size (D50) between 0.2 and 2 mm comprising polyamide and a novolac resin as claimed in claim 1 .

11 . The method of claim 9 , wherein the polyamide composition is used as a filter in the field of the extraction of hydrocarbons.

12 . The method of claim 11 , wherein the hydrocarbons are selected from the group of crude oil and natural gas.

13 . The method of claim 1 , further comprising: forming an article comprising a composition comprising the novolac resin and the polyamide composition, wherein the article has increased acid resistance to a corresponding article free of the novolac resin.

14 . The method of claim 13 , wherein the article is a filter.

Assignees

• Rhodia Operations

Inventors

• Orange Gilles
• Mercier Mathilde

Classifications

• C08L61/06 Primary

  of aldehydes with phenols · CPC title

• C09K8/80

  Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open · CPC title

• C08G8/08

  of formaldehyde, e.g. of formaldehyde formed in situ · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C10G31/09

  by filtration · CPC title