Polyheterosilxoanes For High Refractive Index Materials
AssigneeDow Corning Toray Co., Ltd.
InventorsMasaaki Amako, Maki Itoh, Nanguo Liu, Shawn Keith Mealey, Randall Gene Schmidt
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Abstract
Polyheterosiloxane compositions are disclosed containing at least 70% by weight of the following components: (A) a first metal (M1) selected from Ti, Zr, or Zn, (B) a second metal (M2) selected from a non-lanthanide metal, (C) siloxy units having the formula R2SiO2/2 or R′SiO3/2, where R′ is independently a hydrocarbon group or halogen substituted hydrocarbon group containing 1 to 18 carbon atoms. The disclosed compositions are useful to prepare high refractive index materials.
Claims17
A polyheterosiloxane composition comprising at least 70% by weight of:
- (A) a first metal (M1) selected from Ti, Zr, or Zn,
- (B) a second metal (M2) selected from a non-lanthanide metal,
- (C) siloxy units having the formula R12SiO2/2 or R1SiO3/2
- where R1 is independently a hydrocarbon group or halogen substituted hydrocarbon group containing 1 to 30 carbon atoms,
- wherein;
- the mole fraction of components (A), (B), and (C) in the polyheterosiloxane composition relative to each other is of the formula [M1]a[M2]b[R12SiO2/2]c[R1SiO3/2]d
- where
- a may vary from 0.10 to 0.7,
- b may vary from 0.001 to 0.5,
- c may vary from zero to 0.9,
- d may vary from zero to 0.9,
- with the provisos that c and d both cannot be zero, and the sum of a+b+c+d≈1,
- the polyheterosiloxane composition is soluble in an aromatic hydrocarbon solvent.
A method for preparing a coating comprising:
- I) forming a film of a polyheterosiloxane composition on a surface, wherein the polyheterosiloxane composition comprises at least 70% by weight of:
- (A) a first metal (M1) selected from Ti, Zr, or Zn,
- (B) a second metal (M2) selected from a non-lanthanide metal,
- (C) siloxy units having the formula R12SiO2/2 or R1SiO3/2
- where R1 is independently a hydrocarbon group or halogen substituted hydrocarbon group containing 1 to 30 carbon atoms,
- wherein;
- the mole fraction of components (A), (B), and (C) in the polyheterosiloxane composition relative to each other is of the formula [M1]a[M2]b[R12SiO2/2]c[R1SiO3/2]d
- where
- a may vary from 0.10 to 0.7,
- b may vary from 0.001 to 0.5,
- c may vary from zero to 0.9,
- d may vary from zero to 0.9,
- with the provisos that c and d both cannot be zero, and the sum of a+b+c+d≈1,
- the polyheterosiloxane composition is soluble in an aromatic hydrocarbon solvent;
- and
- II) heating the film to form a cured coating.
Dependencies are inferred from the claim text.