Semi-transparent polymer composite comprising a linear aliphatic polyamide
AssigneesEvonik Degussa GmbH, Evonik Specialty Chemicals (Shanghai) Co., Ltd.
InventorsJianmin YANG, Urs WELZ-BIERMANN, Klaus HUELSMANN, Fei TENG, Juan GUO, Chenyu YE, Zhisheng WANG, Kathrin SALWICZEK
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Abstract
A polymer composite includes a linear aliphatic semi-crystalline polyamide having on average 10 to 14 carbon atoms in the monomer units, or the compound thereof, an S glass fiber, and a core-shell impact modifier. The polymer composite can achieve higher stiffness and impact strength without impairing the transparency significantly. The polymer composite can be used as molding material.
Claims15
1:
- A polymer composite, comprising:
- (a) 60-97 wt % of linear aliphatic polyamide having on average 10 to 14 carbon atoms in the monomer units, wherein the polyamide is at least one selected from the group consisting of semi-crystalline polyamides,
- (b) 2-20 wt % of an S glass fiber comprising:
- 60-66% SiO2, 23-25% Al2O3, 6-11% MgO, 0-9% CaO, 0-0.2% Na2O+K2O, and 0-0.1% Fe2O3, based on the total weight of the glass,
- and
- (c) 1-10 wt % of a core-shell impact modifier which comprises:
- (c1) a core which comprises 60 to 100 wt % of butadiene units and 0 to 40 wt % of styrene units, wherein the core makes up 60 to 95 wt % of the core-shell modifier;
- and
- (c2) a shell which comprises 80 to 100 wt % of methyl methacrylate units and 0 to 20 wt % of modifying monomer units, wherein the shell makes up 5 to 40 wt % of the core-shell modifier,
- wherein the wt % of (a), (b) and (c) being are based on the total weight of the polymer composite.
The polymer composite according to claim 1, wherein the polyamide is selected from the group consisting of PA10, PA1010, PA812, PA128, PA614, PA146, PA11, PA1012, P412.10, PA913, PA139, PA814, PA148, PA616, PA12, PA1212, PA1113, PA 1014, PA1410, PA816, PA618, and any compound thereof.
The polymer composite according to claim 1, wherein the S glass fiber comprises 64-66% SiO2, 24-25% Al2O3, 9.5-10% MgO, 0-0.2% CaO, 0-0.2% Na2O+K2O, and 0-0.1% Fe2O3, based on the total weight of the glass.
The polymer composite according to claim 1, wherein the S glass fiber does not comprise B2O3 and/or TiO2.
The polymer composite according to claim 1, wherein
- a difference in refractive indices between the polyamide component according to (a) and the S glass fiber according to (b) at room temperature is less than 0.01, and/or
- a difference in refractive indices between the polyamide component according to (a) and the core-shell modifier according to (c) at room temperature is less than 0.01,
- measured according to DIN EN ISO 489:1999 by method A.
The polymer composite according to claim 1, wherein said polyamide is transparent with a haze not greater than 60%, measured according to ASTM D1003 on injection molded test specimens of 3 mm in thickness.
The polymer composite according to claim 1, further comprising customary added substances with a total amount not greater than 10 wt % based on the total weight of the polymer composite.
The polymer composite according to claim 1, consisting of the specified constituents.
A molding material consisting of the polymer composite according to claim 1.
The polymer composite according to claim further comprising not greater than 10 wt % in total, based on the total weight of the polymer composite, of flame retardants, stabilizers, plasticizers, glass fibres, fillers, nanoparticles, antistats, dyes, pigments, mould-release agents, and/or flow assistants.
A molding material, comprising:
- polymer composite according to claim 1.
A polymer composite, comprising:
- (a) 60-97 wt % of linear aliphatic polyamide having on average 10 to 14 carbon atoms in the monomer
- (b) 2-30 wt % of an S glass fiber comprising:
- 60-66% SiO2, 23-25% Al2O3, 6-11% MgO, 0-9% CaO, 0-0.2%Na2O+K2O, and 0-0.1% Fe2O3, based on the total weight of the glass,
- and
- (c) 1-10 wt % of a core-shell impact modifier which comprises:
- (c1) a core which comprises 60 to 100 wt % of butadiene units and 0 to 40 wt % of styrene units, wherein the core makes up 60 to 95 wt % of the core-shell modifier;
- and
- (c2) a shell which comprises 80 to 100 wt % of methyl methacrylate units and 0 to 20 wt % of modifying monomer units, wherein the shell makes up 5 to 40 wt % of the core-shell modifier,
- wherein the wt % of (a), (b) and (c) are based on the total weight of the polymer composite.
Dependencies are inferred from the claim text.