Foamable polyamide composition and foam obtained therefrom

Patent metadata

Field	Value
Publication number	US-2016257798-A1
Application number	US-201415033380-A
Country	US
Kind code	A1
Filing date	Oct 16, 2014
Priority date	Oct 29, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

Provided is a foamable polyamide composition comprising a) at least one polyamide comprising at least one carboxylic group; b) at least one thermoplastic rubber; and c) at least one compound having at least one isocyanate group; and optionally d) at least one filler and e) at least one additive.

First claim

1 . A composition comprising:
a) 21.0 to 99.6 wt % of at least one polyamide comprising at least one carboxylic group; b) 0.3 to 9.0 wt % of at least one thermoplastic rubber; c) 0.1 to 3.0 wt % of at least one compound having at least one isocyanate group; d) 0 to 65.0 wt % of at least one filler; and e) 0 to 2.0 wt % of at least one additive; wherein the sum of wt % of the components a) to e) is 100 wt %.

2 . The composition according to claim 1 , wherein the at least one polyamide is selected from the group consisting of polyamide 6, polyamide 6,6, and mixtures and co-polyam ides thereof.

3 . The composition according to claim 1 , wherein the at least one thermoplastic rubber comprises styrenic thermoplastic elastomer, preferably selected from the group consisting of styrene-ethylene/butylene-styrene, styrene-ethylene/propylene-styrene (SEPS), styrene-ethylene/ethylene/propylene-styrene (SEEPS), and any a combinations thereof.

4 . The composition according to claim 1 , wherein the at least one thermoplastic rubber comprises ethylene propylene diene rubber, ethylene propylene rubber, or any a combinations thereof.

5 . The composition according to claim 1 , wherein the at least one compound having at least one isocyanate group comprises an oligomeric polyisocyanate.

6 . The composition according to claim 5 , wherein the oligomeric polyisocyanate is a diisocyanate or a triisocyanate.

7 . The composition according to claim 6 , wherein the polyisocyanate is hexamethylene diisocyanate trimer or isophorone diisocyanate trimer.

8 . The composition according to claim 1 , wherein the at least one filler is selected from the group consisting of glass fibres, glass beads, calcium carbonate, silicates, talc, kaolin, mica, carbon black, graphite, wood powders, and synthetic fibres.

9 . The composition according to claim 1 , wherein the at least one additive is selected from the group consisting of an antioxidant, a pore-forming agent, a surfactant, a nucleating agent, a plasticizer, a matting agent, a pigment, a colorant, a heat stabilizer, a light stabilizer, a bioactive agent, an antisoiling agent, an antistatic agent, flame retardant, and a catalyst to accelerate the decarboxylation by reaction of the carboxylic acid functional group with the isocyanate functional group.

10 . The composition according to claim 1 , wherein the composition is foamable.

11 . A method for producing the composition according to claim 1 , comprising:
i) preparing a master-batch comprising a mixture of the at least one thermoplastic rubber; and the at least one compound having at least one isocyanate group; ii) heating the at least one polyamide; and optionally the at least one filler at a temperature equal to or greater than a melting point of the polyamide to obtain a molten polyamide matrix; and iii) adding at least a portion of the master-batch to the molten polyamide matrix.

12 . A foam obtained from the composition according to claim 1 .

13 . An aeronautical vehicle, a motor vehicle, packaging, or sound insulation comprising a foam according to claim 12 .

14 . A motor vehicle comprising the foam according to claim 12 .

15 . The composition according to claim 8 , wherein the at least one filler comprises glass fibers.

Assignees

• Rhodia Operations

Inventors

• Park Jung Hoon
• Yu Yeong-Chool

Classifications

• C08J2377/06

  Polyamides derived from polyamines and polycarboxylic acids (C08J2377/10 takes precedence) · CPC title

• C08J2201/024

  Preparation or use of a blowing agent concentrate, i.e. masterbatch in a foamable composition · CPC title

• C08J2207/00

  Foams characterised by their intended use · CPC title

• C08J9/0028

  containing nitrogen · CPC title

• C08L53/025

  modified · CPC title