Flexible polyamide composition
AssigneeDsm N.V.
InventorGuido P. C. Beusen
Life of this patent
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Abstract
The invention relates to a flexible polyamide composition containing at least 50 parts by weight of non-cross-linked rubber per 50 parts by weight of polyamide and the production thereof. The polyamide has a molecular weight such that the melt viscosity at the processing temperature is at most 300 pa.s, preferably at most 200 pa.s. The rubber's Mooney viscosity is at least 40, most preferable is a rubber with a Mooney viscosity of at least 60. The rubber has been functionalized. Preferably a combination of a functionalized and a non-functionalized rubber is used. The rubber particles in the polyamide matrix have a particle size of at most 5 μm, preferably at most 3 μm.
Claims21
A process for preparing a flexible polyamide composition comprising:
- mixing in the melt phase at parts by weight relative to the total weight of components A+B,
- A) 30-50 parts by weight of at least one polyamide and
- B) 70-50 parts by weight of a rubber composition comprising:
- (b1) at least one non-functionalized rubber and
- (b2) at least one rubber containing groups that can react with polyamide,
- wherein the Mooney viscosity of said rubber composition is at least 40, and the polyamide forms a continuous phase.
A flexible polyamide composition comprising, relative to the total weight of components A+B:
- A) 30-50 parts by weight of at least one polyamide and
- B) 70-50 parts by weight of a rubber composition comprising:
- (b1) at least one non-functionalized rubber, and
- (b2) at least one rubber containing groups that can react with polyamide,
- wherein the Mooney viscosity of said rubber composition is at least 40, and the rubber composition is dispersed as discrete particles in a continuous polyamide phase.
Dependencies are inferred from the claim text.