SMMA Molding Composition for Deep Black High Gloss
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Solution Overview
Problem
Existing thermoplastic molding compositions struggle to achieve deep black colors with high gloss and maintain dimensional stability in humid environments, particularly with styrene copolymers, due to limitations in UV stability and clarity when using carbon black pigments.
Innovation Solution
A thermoplastic molding composition comprising a copolymer of vinylaromatic monomers and methyl methacrylate, combined with specific dye components and a controlled amount of carbon black pigment, which provides a deep-black color with high gloss and improved UV stability and dimensional stability in humid conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black pigment is used to achieve deep black color, then darkness is improved, but gloss and UV stability deteriorate
Solution Approach 1:
The patent combines carbon black pigment with specific dye components (solvent green 3, solvent red 179, and/or solvent violet 31000) to create a composite coloring system. This merging allows the carbon black to provide darkness while the dyes compensate for gloss loss and improve UV stability, achieving deep black color (L* ≤ 2.0) without sacrificing surface quality or weather resistance.
Solution Approach 2:
The invention uses a composite material approach by formulating a molding composition that integrates multiple coloring agents (carbon black and organic dyes) within a specific polymer matrix (styrene copolymer with controlled composition). This composite system synergistically combines the darkness-providing capability of carbon black with the gloss-maintaining and UV-stabilizing properties of the organic dyes.
2Illumination intensity
If carbon black pigment is used to achieve deep black color, then darkness is improved, but dimensional stability in humid environments deteriorates
Solution Approach 1:
The patent merges carbon black pigment with specific organic dye components to create a balanced coloring system. This combination allows the formulation to achieve deep darkness while the organic dyes contribute to maintaining dimensional stability in humid environments, preventing the degradation that occurs when carbon black is used alone at high concentrations.
Solution Approach 2:
The invention changes the parameters of the coloring system by specifying precise amounts of carbon black (0.01-5% by weight) in combination with specific dye components. This parameter optimization ensures that darkness is maximized while dimensional stability is preserved, as the organic dyes counterbalance the potential negative effects of carbon black on moisture resistance.
3Illumination intensity
If high amounts of carbon black are used to achieve deep black color, then darkness is improved, but clarity and gloss deteriorate
Solution Approach 1:
The patent merges carbon black pigment with specific organic dye components (solvent green 3, solvent red 179, and/or solvent violet 31000) in controlled amounts. This combination allows the formulation to achieve deep black color (L* ≤ 2.0) while the organic dyes compensate for the gloss-reducing effect of carbon black, maintaining surface clarity and shine even at optimal carbon black concentrations.
Data Source
AI summary
The invention relates to thermoplastic molding composition, comprising the components (a), (b) and (c) and optionally (d), comprising (a) 90 to 99.5% by weight of at least one copolymer (a), which comprises 30 to 90 % by weight of vinylaromatic monomer (a1), and 10 to 70 % by weight of methyl methacrylate (a2); (b) 0.1 to 1.5% by weight of at least two dye components (b1) and (b2) of different color families, soluble in the thermoplastic molding composition; (c) 0.01 to 5% by weight of carbon black pigment (c) and (d) optionally up to 5% by weight of one or more further additives (d), where the thermoplastic composition has a deep-black color with L*-values from 0.5 to 2.0 as measured with 45°/0° geometry, a high gloss of more than 93.0 and wherein the total weight of components (a) to (d) give a total of 100 percent by weight.