Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-02-06
2000-07-11
Mullis, Jeffrey C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525238, 525242, 525301, 525310, C08L 3312
Patent
active
06087449&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to thermoplastic molding materials containing a mixture of polymerizing a mixture consisting of ester of acrylic acid mixture consisting of polymerizing a monomer mixture consisting of obtainable by polymerizing a monomer mixture consisting of (where the individual stated percentages C21, C22 and C23 sum to 100% by weight) methacrylic acid and obtainable by polymerizing a monomer mixture consisting of methacrylic acid and acid, 100% by weight, and based on the sum of the components A, B and C, refractive index of the first graft shell (n.sub.D -C2) is greater than the refractive index of the second graft shell (n.sub.D -C3) and the refractive index of the total graft shell (n.sub.D -C2+n.sub.D -C3) is less than the refractive index of the core (n.sub.D -C1), the magnitude of the difference between the refractive index of the total component C (n.sub.D -C) and that of the total matrix (n.sub.D -A+n.sub.D -B) is less than or equal to 0.02.
The present invention furthermore relates to a process for the preparation of the novel thermoplastic molding materials, their use and the moldings obtainable therefrom.
EP-A 0 062 223 discloses highly glossy, transparent, impact-resistant, thermoplastic molding materials which consist of a hard methyl methacrylate polymer, a hard styrene/acrylonitrile polymer and a soft graft copolymer of alkyl (meth)acrylate and, if required, styrene on a rubber. The thermoplastic molding materials described also exhibit a good stress cracking resistance.
However, for some applications, inter alia for machine cover panels, for example in office machines or copiers, thermoplastic molding materials which, in addition to good flow behavior, also have high transmittance and little haze are required.
U.S. Pat. No. 4,083,896 likewise describes transparent blends of a hard methyl methacrylate polymer and a hard styrene/acrylonitrile polymer, which however are modified with rubbers comprising butadiene, acrylonitrile and styrene. Such transparent blends have a relatively high yellowness index, which is unacceptable for the abovementioned applications.
The rubbers used in EP-A 0 062 223 and based on a soft graft copolymer of alkyl (meth)acrylate are employed in particular for increasing the impact resistance. Such rubbers can also be used for modifying polyvinyl chloride (PVC) (EP-A 0 082 717, AU-A 9180-213 and DE-A 39 38 877).
Furthermore, GB-A 2 156 365 discloses that copolymers based on methyl methacrylate and styrene can be modified with a graft copolymer comprising butadiene, styrene and methyl methacrylate, this graft copolymer having only one graft shell. However, the blends obtained have an impact resistance which is not sufficiently high for some applications.
It is an object of the present invention to remedy the disadvantages described and to provide improved thermoplastic molding materials which have good impact resistance and good flow and are furthermore distinguished by high transmittance and little haze. In addition, the molding materials should be capable of being processed to give shaped articles which have very little edge yellowness.
We have found that this object is achieved by the thermoplastic molding materials defined at the outset. We have also found a process for their preparation, their use for the production of moldings, and moldings produced from the novel thermoplastic molding materials.
In preferred embodiments, the novel thermoplastic molding materials contain mixtures of polymerizing a mixture consisting of ester of acrylic acid mixture consisting of polymerizing a monomer mixture consisting of obtainable by polymerizing a monomer mixture consisting of (where the individual stated percentages C21, C22 and C23 sum to 100% by weight) methacrylic acid and obtainable by polymerizing a monomer mixture consisting of methacrylic acid and acid, 100% by weight and weight, based on the sum of the components A, B and C.
The methyl methacrylate polymers (A) used in the novel thermoplastic molding materials are either homopolymers of methyl methac
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Neumann Rainer
Tiefensee Kristin
BASF - Aktiengesellschaft
Mullis Jeffrey C.
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