Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
  • C08L25/04—Homopolymers or copolymers of styrene
  • C08L25/08—Copolymers of styrene
  • C08L25/12—Copolymers of styrene with unsaturated nitriles
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
  • C08L33/12—Homopolymers or copolymers of methyl methacrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/08—Homopolymers or copolymers of acrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/08—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
  • C08L51/085—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds on to polysiloxanes

Definitions

• the invention relates to impact-resistant polymethacrylate molding compositions (PMMA molding compositions) with improved low-temperature impact strength.
• PMMA molding materials use core / shell (K / S) or core / shell / shell (K / S1 / S2) particles (particle size 100-1000 nm) as impact modifiers, which are usually via emulsion polymerization getting produced.
• the core consists of an elastomeric phase - in K / S1 / S2 particles, the elastomeric phase is generally the shell that has been grafted onto the core (S1).
• suspension polymers can also be used.
• the elastomeric phase grafted with MMA is relatively finely distributed in the beads (matrix material - e.g. PMMA).
• the elastomeric phase usually consists of cross-linked copolymer, which is largely produced with the help of butyl acrylate.
• an elastomeric phase e.g. Polybutadiene used.
• K / S particles are grafted silicone particles - MMA, styrene and acrylonitrile are used as grafting monomers.
• a specialty are K / S particles in which the core consists of a silicone and acrylic rubber mixture (no grafting) (inter alia EP 430 134).
• K / S1 / S2 particles are described in DE 3 617 267, DE 3 720 475, DE 3 801 537, DE 3 822 667, DE 3 839 587, DE 4 040 986, DE 4 342 048 and EP 433 906, among others.
• the core of the K / S1 / S2 particles in DE 3 720 475 consists of a vinyl rubber, S1 of silicone rubber and S2 of various copolymers.
• the graft copolymers produced are used as impact modifiers for certain plastics (often PC, SAN, polystyrene) or polymer blends.
• EP 430 134 Here, a core consisting of a silicone rubber and an acrylic rubber (these looped rubbers are produced by swelling and subsequent polymerization of acrylate derivatives in the silicone latex) is grafted with vinyl monomers.
• the material for impact modification of molding compositions is also described - however, only polycarbonate (PC) and / or polyester molding compositions are mentioned here.
• No. 4,690,986 Here an impact-resistant molding compound (sz) is claimed which is produced on the basis of a graft copolymer (via emulsion polymerization).
• the graft copolymer is a K / S product.
• the core consists of a crosslinking agent (siloxane with methacrylate group connected via several CH2 groups) and tetrafunctional silane as a crosslinking agent. Both the molding compound (sz) itself and the manufacturing process for this are described.
• JP 612,135,462 Here a molding composition (sz) is claimed which is produced on the basis of a graft copolymer (via emulsion polymerization).
• the graft copolymer consists of siloxane grafted with vinyl monomers.
• EP 308 198 Here a molding compound made of PMMI and grafted polysiloxane is claimed.
• the grafted polysiloxane is produced by grafting monomers and at least one "graft crosslinking agent".
• the graft crosslinking agent is the crosslinking agent (siloxane with methacrylate group connected via several CH2 groups) in US Pat. No. 4,690,986.
• the tetrafunctional silane is also mentioned as a crosslinking agent in the subclaims.
• EP 332 188 Here a graft copolymer similar to that used in EP 430134 is used to modify FM.
• particles are grafted with styrene and these are used to modify a polyether / polysulfone blend.
• DE 4 342 048 Here a graft copolymer is claimed as K S1 / S2 particles.
• a silicone rubber acts as the core - S1 is predominantly made of acrylates (min. 70%) - the monomers for S2 are very broad (e.g. 50-100% methyl methacrylate).
• Sz - FM are also described in the subclaims based on the claimed graft copolymer - the polymer for the matrix is also very broad here.
• an FM which consists of 20-80% of conventional polymers and 80-20% of graft copolymers.
• the graft copolymer consists of K / S1 / S2 particles, the core being composed of silicone rubber and S1 of acrylate rubber.
• S2 is produced by redox polymerization (emulsion) of various monomers. As an example, only a sz-modified SAN molding compound is listed.
• WO 99/41315 Here, a dispersion is claimed which contains a mixture of particles consisting of vinyl copolymers and consisting of PMMA-coated silicone rubber. This dispersion can be used, among other things, as an impact modifier.
• Impact-resistant molding compounds based on PMMA are manufactured on a large scale. Increased impact strength of the molding compounds is achieved by using so-called impact modifiers. These modifiers are compounded into the corresponding PMMA standard molding compounds. With the help of the usual modifiers, which contain butyl acrylate rubber as an elastomeric phase, acceptable impact strengths down to -10 ° C in PMMA FM are achieved. In order to achieve acceptable impact strengths at even lower temperatures, another rubber (with a lower glass transition temperature (T g ) than butyl acrylate rubber) must be used as the elastomeric phase.
• T g glass transition temperature
• z. B polybutadiene as an elastomeric phase.
• a modifier should now be found which achieves an acceptable impact strength of the PMMA molding compounds or the PMMA / SAN blends at lower temperatures ( ⁇ - 10 ° C) and the weather resistance of the molding compound or blend in comparison to those with modifiers based on polybutadiene PMMA molding compounds or PMMA / SAN blends is improved.
• melt viscosity, strand expansion, heat distortion temperature or Vicat softening temperature of the corresponding molding compounds must not suffer from the use of the new modifiers.
• EP 492 376 claims a graft copolymer (and also the process for producing this graft copolymer), which consists of K / S or K / S1 / S2 particles.
• the core and the optional intermediate shell are made of silicone rubber and are more precisely defined - the outer shell is made by emulsion polymerization of various monomers (without any other emulsifier).
• the particle size is limited to 10-300 nm - the polydispersity index is a maximum of 0.2.
• the graft copolymer claimed is, inter alia, mixed with PMMA and the KSZ measured at 23 ° C.
• EP 492 376 describes the preparation of the silicone graft copolymers and describes their use for impact modification of polyvinyl chloride (PVC), PMMA, polystyrene (PS) and styrene-acrylonitrile copolymer (SAN).
• PVC polyvinyl chloride
• PS polystyrene
• SAN styrene-acrylonitrile copolymer
• the notched impact strength of PMMA blends was only determined at 23 ° C Celsius, and there are no indications as to their usability or even special effects at lower temperatures.
• the compositions of the individual examples are documented in Appendix 1.
• Core-Shell Modifier SLM 445906 from Wacker.
• D precipitated emulsion polymer, consisting of silicone elastomer particles with PMMA shell. The material is largely free of emulsifiers. Production described in EP 492 376). Particle size approx. 100 nm, monomodal distribution.
• Acrylic rubber modifier from Röhm Composition: core: copolymer of methyl methacrylate (95.7% by weight), ethyl acrylate
• the production of the modifier is based on the method as disclosed in DE 33 00 526. Testing the molding compounds
• Test specimens were produced from the mixed molding compositions.
• the molding compounds and the corresponding test specimens were tested using the following methods:
• Vicat softening temperature Determination of the Vicat (16h / 80 ° C): softening temperature test standard ISO 306 (method B50): (1994)
• HDT (16h / 80 ° C A 1.8MPa): determination of the dimensional stability temperature, test standard: ISO 75 (Sept. 1993)
• the notched impact strength of the individual molding compositions is at the same level at 23 ° C - at -20 ° C the notched impact strength is significantly higher (better) for the molding compositions mixed with silicone modifier.
• melt viscosity, strand expansion, dimensional stability temperature or Vicat softening temperature remain at the same level in all the molding compositions compared.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Graft Or Block Polymers (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Silicon Polymers (AREA)

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Cited By (3)

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Citations (3)

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• 2000
  • 2000-10-31 DE DE10054051A patent/DE10054051A1/de not_active Ceased
• 2001
  • 2001-10-22 JP JP2002539432A patent/JP4060183B2/ja not_active Expired - Fee Related
  • 2001-10-22 EP EP01992740A patent/EP1330493B1/de not_active Expired - Lifetime
  • 2001-10-22 US US10/415,106 patent/US6890993B2/en not_active Expired - Fee Related
  • 2001-10-22 WO PCT/EP2001/012172 patent/WO2002036682A1/de not_active Ceased
  • 2001-10-22 CA CA2427431A patent/CA2427431C/en not_active Expired - Fee Related
  • 2001-10-22 DE DE50108705T patent/DE50108705D1/de not_active Expired - Lifetime
  • 2001-10-22 AT AT01992740T patent/ATE315613T1/de not_active IP Right Cessation
  • 2001-10-22 AU AU2002216976A patent/AU2002216976A1/en not_active Abandoned

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