Search

KR-102963635-B1 - SiCoPC blend containing phosphazene and silicon/acrylate impact modifier

KR102963635B1KR 102963635 B1KR102963635 B1KR 102963635B1KR-102963635-B1

Abstract

The present invention relates to a composition for producing a thermoplastic molding formulation, comprising or consisting of the following components: A) 42 to 80 wt% of at least one polymer selected from the group consisting of aromatic polycarbonates and aromatic polyester carbonates; B) 2 to 38 wt% of at least one polysiloxane-polycarbonate block cocondensate; C) 1 to 15 wt% of at least one rubber-modified graft polymer having the following: C.1) a shell composed of at least one vinyl monomer in an amount of 5 to 95 wt% relative to graft polymer C; C.2) a graft base composed of silicone-acrylate composite rubber in an amount of 95 to 5 wt% relative to graft polymer C; D) 2 to 10 wt% of at least one phosphazene; E) 0 to 10 wt% of at least one additive. Additionally, the present invention relates to the molding compound itself; the use of the composition or molding compound for producing a molded body; and the molded body itself.

Inventors

  • 엑켈, 토마스
  • 마이어, 알렉산더

Assignees

  • 코베스트로 인텔렉쳐 프로퍼티 게엠베하 운트 콤파니 카게

Dates

Publication Date
20260512
Application Date
20191104
Priority Date
20181129

Claims (15)

  1. A composition for manufacturing a thermoplastic molding formulation, comprising or composed of the following components: A) 42% to 80% by weight of at least one polymer selected from the group consisting of aromatic polycarbonates and aromatic polyester carbonates, B) At least one polysiloxane-polycarbonate block cocondensate in an amount of 2% to 38% by weight, characterized by containing a siloxane block derived from one of the following structures: , and Here, R1 represents hydrogen, Cl, Br, or a C1-C4-alkyl group, and R2 independently represents an aryl or alkyl group, and X represents a single bond, C1 to C5-alkylene, C2 to C5-alkylidene, C5 to C12-cycloalkylidene, -O-, -SO-, -CO-, -S-, or -SO2- , and n is a number from 10 to 150 when determined by 1H-NMR spectroscopy, and m is a number between 1.5 and 5 when determined by 1H-NMR spectroscopy, C) at least one rubber-modified graft polymer comprising 1% to 15% by weight of the following: C.1) A shell composed of at least one vinyl monomer in an amount of 5% to 95% by weight based on graft polymer C, and C.2) A graft substrate composed of 95% by weight to 5% by weight of silicone-acrylate composite rubber based on graft polymer C, D) 2% to 10% by weight of at least one type of phosphazene, E) 0% to 10% by weight of at least one additive.
  2. A composition according to claim 1, characterized in that the graft substrate C.2 contains 20% to 80% by weight of silicone rubber and 80% to 20% by weight of polyalkyl (meth)acrylate rubber.
  3. A composition according to claim 1 or 2, characterized in that component B contains a siloxane block derived from the following structure: Here, R1 represents hydrogen, Cl, Br, C1-C4-alkyl, or methyl, and R2 independently represents an aryl, alkyl, or methyl group, and X represents a single bond, C1 to C5-alkylene, C2 to C5-alkylidene, C5 to C12-cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO2- , or isopropylidene, and n is a number from 10 to 150 when determined by 1H-NMR spectroscopy, and m is a number from 1 to 10 when determined by 1H-NMR spectroscopy.
  4. A composition according to claim 1 or 2, characterized in that component B contains a siloxane block in a ratio of 2% to 20% by weight.
  5. A composition according to claim 1 or 2, characterized in that methyl methacrylate is used as component C.1.
  6. A composition according to claim 1 or 2, characterized in that component D is a cyclic phosphazene of formula (15b): Here k represents 1 or an integer from 1 to 10, and Here, the trimer content (k = 1) is 60 to 98 mol% based on component C, and Here R is the same or different in each case, and is an amine radical; in each case, optionally a halogenated or fluorine-halogenated C1- to C8-alkyl, methyl, ethyl, propyl, or butyl; C1- to C8-alkoxy, methoxy, ethoxy, propoxy, or butoxy; in each case, optionally an alkyl-substituted, C1-C4-alkyl-substituted, halogen-substituted, chlorine-substituted, and/or bromine-substituted, C5- to C6-cycloalkyl; in each case, optionally an alkyl-substituted, C1-C4-alkyl-substituted, halogen-substituted, chlorine-substituted, bromine-substituted, and/or hydroxyl-substituted C6- to C20-aryloxy, phenoxy, or naphthyloxy; In each case, optionally represents an alkyl-substituted, C1-C4-alkyl-substituted, halogen-substituted, chlorine-substituted, and/or bromine-substituted, C7- to C12-aralkyl, or phenyl-C1-C4-alkyl; a halogen radical or chlorine; or an OH radical.
  7. A composition according to claim 6, characterized in that component D is a cyclic phosphazene where R = phenoxy.
  8. A composition according to claim 6, characterized in that, in each case, component D has a trimer ratio of 65 to 85 mol% (k=1), a tetramer ratio of 10 to 20 mol% (k=2), a higher oligomeric phosphazene ratio of 5 to 15 mol% (k=3, 4, 5, 6 and 7), and a phosphazene oligomer ratio of 0 to 1 mol% with k ≥ 8, based on component D.
  9. A composition according to claim 1 or 2, characterized in that component E contains talc.
  10. A composition according to claim 1 or 2, comprising the following: Component A in an amount of 50% to 70% by weight, Component B in an amount of 15% to 35% by weight, Component C in an amount of 5% to 11% by weight, Component D in an amount of 4% to 8% by weight, Component E in an amount of 0.2% to 5% by weight.
  11. A composition comprising components A, B, C, D, and E in claim 1 or 2.
  12. A molded formulation prepared from a composition according to paragraph 1 or 2.
  13. A molded article obtainable from a composition according to paragraph 1 or 2.
  14. delete
  15. delete

Description

SiCoPC blend containing phosphazene and silicon/acrylate impact modifier The present invention relates to a composition based on a polycarbonate and a polysiloxane-polycarbonate block cocondensate (also referred to hereinafter as SiCoPC or a siloxane-containing block cocondensate) for producing a thermoplastic molding composition, the molding composition itself, the use of the composition or the molding composition for producing a molded article, and the molded article itself. Polycarbonate compositions including blends with additional thermoplastic materials have long been known. By changing the components and their proportions in the composition, it is possible to adapt the thermal, rheological, and mechanical properties of the molding formulations obtained by the composition and the molded articles produced therefrom to specific requirements over a wide range. Additionally, numerous patent applications state that their toughness properties can be improved by using rubber-modified graft polymers. It is also known that excellent flame retardancy can be achieved by using phosphorus-containing flame retardants. However, some flame retardants, such as phosphates, reduce toughness and have a plasticizing effect, so their use also impairs heat resistance. Therefore, phosphazene can be used as an alternative flame retardant. Although they are not as cost-effective as phosphates and reduce melt fluidity, they generally also make it possible to achieve excellent heat resistance along with acceptable toughness characteristics. Polysiloxane-polycarbonate block conjugates are known to exhibit advantages over conventional polycarbonates (e.g., bisphenol A-based homopolycarbonates) in some cases, for example, in terms of important properties such as low-temperature impact strength/low-temperature notch impact strength, chemical resistance and external weather resistance, as well as aging characteristics and flame resistance. These polysiloxane-polycarbonate block cocondensates can also be used alone or with homopolycarbonate, in combination with impact modifiers and flame retardants. US 2007/0149722 A discloses a flame-retardant thermoplastic composition comprising a polycarbonate, a polycarbonate-siloxane copolymer, an impact modifier, and a flame retardant. The impact modifier is preferably based on a butyl acrylate-based rubber, and bisphenol A diphosphate (BDP) is mentioned as the flame retardant. The composition is characterized by excellent physical properties, such as impact strength and fluidity, along with excellent flame retardancy. EP 1713863 B1 discloses a polycarbonate composition containing a polycarbonate-siloxane copolymer, a mineral filler, and a phosphate-based flame retardant. The composition is characterized by excellent flame retardancy and excellent mechanical properties along with a thin wall thickness. US 2013/0317143 A1 discloses a flame-retardant composition comprising a polycarbonate, a polycarbonate-siloxane copolymer, an impact modifier, and a phosphazene. The impact modifiers described include, for example, MBS, ABS, silicone/acrylate-based modifiers, ASA, and AES. The use of phosphazene as a flame retardant achieves excellent heat resistance along with excellent toughness and flame retardancy. WO 2015/065611 A1 discloses a flame-retardant polymer composition comprising a polycarbonate, a polycarbonate-siloxane copolymer, a reinforcing agent, a phosphorus-based flame retardant, and optionally an impact modifier. Suitable flame retardants are phosphates and phosphazenes. The composition is characterized by excellent stiffness and toughness, along with excellent processability, appearance, and flame retardancy at thin wall thicknesses. WO 2015/022676 A1 discloses a thermoplastic composition comprising at least one polycarbonate, at least one impact modifier, at least one mineral filler, and at least one flame retardant. The composition can be used for articles where material requirements are stringent in terms of stiffness, toughness, fluidity, flame retardancy, and heat resistance. JP 2015-034191 A discloses a transparent thermoplastic molding formulation containing polycarbonate, a polycarbonate-polyorganosiloxane copolymer, and phosphazene. The molding formulation does not contain an anti-dip agent and is characterized by excellent toughness, fluidity, and flame retardancy. WO 2014/086800 A1 discloses a rubber-modified graft polymer having a graft substrate selected from polycarbonate, silicone rubber, silicone-acrylate rubber and acrylate rubber, and a composition containing phosphazene. The composition achieves excellent heat resistance, flame retardancy, notch impact strength and chemical resistance. However, the disclosed molding formulation and the molded article produced therefrom are not yet suitable for some applications in terms of the balance of mechanical properties, hydrolytic stability, and chemical resistance. Furthermore, polysiloxane-polycarbonate block cocondensates and g