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Impact-resistant poly(meth)acrylate moulding masses with high thermal stability
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A technology of methyl methacrylate and acrylate, applied in the field of injection molding parts, can solve the problems of reducing thermal deformation resistance, surface hardness, and unsatisfactory
Inactive Publication Date: 2008-01-16
EVONIK ROEHM GMBH
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Problems solved by technology
[0004] In addition to the disadvantage of the self-weight of the steel sheet, an additional disadvantage when using this material is the following: the molded parts have to undergo a painting process after manufacture in order to achieve a "class A surface"
However, this modification reduces heat deformation resistance and surface hardness, so that even impact-modified PMMA does not meet various requirements
Method used
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[0064] Preparation of polymer mixtures
[0065] The polymer mixture can be prepared by dry blending of the components, which can take the form of powder, granules (Körner) or preferably granules (Granulate).
[0066] The polymer mixture can also be processed by melting and mixing of the individual components in the molten state or by melting of a dry premix of the individual components to obtain a ready-to-use molding composition. For example, this can be done in a single- or twin-screw extruder. The extrudate obtained can then be pelletized. Conventional additives, auxiliaries and / or fillers can be blended directly or subsequently added by the end user as needed.
[0067] Component a.)
[0068] Component a.) is a low molecular weight (meth)acrylate (co)polymer, which is characterized by a solution viscosity in chloroform at 25°C (ISO 1628-Part 6) less than or equal to 55ml / g, preferably less than Or equal to 50ml / g, especially 45-55ml / g.
[0069] This can correspond to a mole...
Embodiment 1
[0219] The polymer mixture consists of the following substances:
[0220] Component a.): 50wt%
[0221] Component b.): 15.6% by weight
[0222] Component c.):-
[0223] Component d.): 34.4wt%
[0224] Lubricant: 0.1wt% stearyl alcohol (based on the total amount of components a.) to d.))
Embodiment 2
[0226] The polymer mixture consists of the following substances:
[0227] Component a.): 50wt%
[0228] Component b.): 13wt%
[0229] Component c.): 37wt%
[0230] Component d.):-
[0231] Lubricant: 0.2wt% stearyl alcohol (based on the total amount of components a.) to d.))
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Abstract
The invention relates to a polymer mixture, made from the (meth)acrylate (co)polymer components a.), b.), c.) and / or d.) from claim 1), whereby a sample body produced from the polymer mixture has the following properties: a tensile modulus (ISO 527) of at least 2,500 MPa, a Vicat softening point VET (ISO 306-B50) of at least 110 DEG C, an impact strength (ISO 179-2D, flatwise) of at least 30 KJ / m<2> and a melt-flow index MVR (ISO 1133, 230 DEG C / 3.8 kg) of at least 1.0 cm<3> / 10 min. The invention further relates to injection moulded moulding bodies and the use of the polymer mixture for the production of injection moulded pieces.
Description
Technical field [0001] The invention relates to an impact-resistant poly(meth)acrylate moulding composition (PMMA moulding composition) with high heat deformation resistance (Wörmeformbestndigkeit) and its use for injection moulded parts. Background technique [0002] Starting from the requirement for ever-decreasing fuel consumption, the automotive industry strives to continuously reduce the self-weight of motor vehicles. Although in the past, steel parts were basically used in the outer area of motor vehicles, it is desirable for economic reasons to prepare these elements from materials with lower density while achieving it at reduced manufacturing costs. [0003] The performance of these molded parts is through low dead weight, and at the same time, with high weather resistance, high rigidity, good impact resistance, good dimensional stability, especially when heated in the long-term use temperature range, good chemical resistance, As compared to cleaning agents, good scrat...
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Application Information
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