| 摘要 |
A polyamide molding composition for the production of a stain-resistant article, the staining tendency (ST) of the article being at least 2. The composition contains 30-100% by weight of a polyamide or a polyamide mixture, consisting of 50-100% by weight of at least one amorphous and/or microcrystalline polyamide having a glass transition temperature of at least 100° C., based on: 20-100 mol % of at least one cycloaliphatic diamine; and 0-80 mol % of at least one other aliphatic and/or aromatic diamine; and also aromatic and/or aliphatic dicarboxylic acids comprising at least 6 carbon atoms, and 0-50% by weight of at least one semi-aromatic polyamide. In addition, the molding composition comprises any of inorganic white pigments, fillers, impact toughness modifier and/or flame retardants. |
| 主权项 |
1. A method for the production of a stain-resistant article, a staining tendency (ST) of the article being 1 or 2, wherein the method includes the following steps:
preparing a polyamide moulding composition consisting of: (A) 30-99.5% by weight of a polyamide or a polyamide mixture, consisting of:
(A1) 50-100% by weight of at least one amorphous and/or microcrystalline polyamide having a glass transition temperature of at least 100° C., measured according to ISO-norm 11357-11-2,
wherein amorphous polyamides of the polyamide (A1) have heats of fusion of at most 4 J/g, andmicrocrystalline polyamides of the polyamide (A1) have heats of fusion in the range of 4-25 J/g,in each case determined according to ISO 11357-11-2 on granulate, differential scanning calorimetry (DSC) with a heating rate of 20° C./min, based on:(a1) 20-100 mol % of at least one cycloaliphatic diamine; and 0-80 mol % of at least one other aliphatic and/or aromatic diamine,
wherein the mol % within component (a1) complement to 100 mol %; and(a2) aromatic and/or aliphatic dicarboxylic acids comprising at least 6 carbon atoms,with the proviso that up to 45 mol % of the totality of monomers of components (a1) and (a2) can be replaced by lactams comprising 6 to 12 carbon atoms or amino carboxylic acids comprising 6 to 12 carbon atoms,(A2) 0-50% by weight of at least one semi-aromatic polyamide different from (A1);wherein both (A1) and (A2) are present in the composition and together form 100% of component (A); (X) 0.5-10% by weight of one or several inorganic white pigments having an average particle size (D50) in the range of 0.1-40 μm, selected from the group consisting of barium sulphate, zinc oxide, zink sulphide, lithopone and titanium dioxide, in the rutile or anatase modification, titanium-zinc mixed oxides, and mixtures thereof; (B) 0-70% by weight of fibrous fillers (B1) and/or particulate fillers (B2) with the exception of inorganic white pigments; (C) 0-30% by weight of polymers different from (A); (D) 0-25% by weight of a flame retardant; and (E) 0-3% by weight of additives, wherein the sum of the constituents (A)-(E) including (X) makes up 100% by weight and; injection moulding or extruding said polyamide moulding composition to form at least part of said stain-resistant article, wherein the staining tendency (ST) is determined by a colour impression ΔE and is classified as follows: ST=1: 0≦ΔE≦2 ST=2: 2<ΔE≦6 ST=3: 6<ΔE≦12 ST=4: ΔE>12,the colour impression ΔE is calculated in accordance with ISO 12647 and ISO 13655 as follows:ΔE=(Lsample*-Lreference*)2+(asample*-areference*)2+(bsample*-breference*)2. |
