Polycarbonate having improved thermal and mechanical properties and reduced coefficients of thermal expansion

Patent metadata

Field	Value
Publication number	US-9676716-B2
Application number	US-97306010-A
Country	US
Kind code	B2
Filing date	Dec 20, 2010
Priority date	Dec 21, 2009
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

The present invention relates to thermoplastic high-Tg polycarbonates and molding materials which are distinguished by improved thermal properties and improved mechanical properties, in particular by reduced thermal expansion. The present invention furthermore relates to a process for the preparation of these polycarbonates. In particular, this invention relates to polycarbonates which the structural unit which derives from phthalimide of the formula (I) and polycarbonate compositions and molding materials therefrom as well as a process for the preparation of these polycarbonates, and the use thereof, in particular as reflectors and display substrates.

First claim

The invention claimed is:

1. A multilayer product comprising a substrate layer comprising a further layer at least on one side, wherein said substrate layer comprises a (co)polycarbonate comprising a bisphenol of formula (Ia) as a repeating monomer unit and one or more diphenols of formula (II) as repeating monomer units in said (co)polycarbonate

wherein
R 1 and R 2 are, independently of one another, hydrogen or C 1 -C 18 -alkyl, and
X is a single bond or isopropylidene,
wherein said substrate layer comprises a (co)polycarbonate comprising from 12 to 55 mol % of a bisphenol of formula (Ia) as a repeating monomer unit and from 88 to 45 mol %, based in each case based on the sum of diphenols used, of one or more diphenols of formula (II) as repeating monomer units in said (co)polycarbonate, and wherein said (co)polycarbonate further comprises one or more diphenols selected from diphenols of formula (IV), wherein said diphenols of formula (IV) is an isomer mixture of diphenols of formulae (IVa) and (IVb)

wherein
R 5 is, independently of one another, hydrogen or C 1 -C 10 alkyl, and
R 6 is C 1 -C 10 alkyl or optionally substituted phenyl or benzyl.

2. The multilayer product of claim 1 , wherein said further layer on said substrate layer is a metal layer.

3. The multilayer product of claim 2 , further comprising a protective layer applied to said metal layer.

4. A process for producing the multilayer product of claim 3 , comprising the step of applying said protective layer in a PECVD or plasma polymerization process.

5. The process of claim 4 , comprising the step of applying said protective layer in a PECVD or plasma polymerization process from one or more readily volatile components selected from the group consisting of hexamethyldisiloxane (HMDSO), hexamethyldisilazane (HMDS), tetramethyldisiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, and trimethoxymethylsilane.

6. The multilayer product of claim 2 , wherein said metal layer is an aluminium layer.

7. The multilayer product of claim 2 , wherein said metal layer has a thickness from 20 to 500 nm.

8. The multilayer product of claim 2 , wherein the (co)polycarbonate is transparent.

9. The multilayer product of claim 1 , wherein said diphenols of formula (II) are selected from the group consisting of bisphenol A, 4,4′-dihydroxybiphenyl, and 2,2-bis(3-methyl-4-hydroxyphenyl)propane.

10. The multilayer product of claim 1 , wherein said (co)polycarbonate further comprises one or more additives selected from the group consisting of heat stabilizers, demoulding agents, UV absorbers, and fillers.

11. The multilayer product of claim 1 , wherein said substrate layer comprises a (co)polycarbonate comprising from 45 to 55 mol % of a bisphenol of formula (Ia) as a repeating monomer unit and from 55 to 45 mol %, based in each case based on the sum of diphenols used, of one or more diphenols of formula (II) as repeating monomer units in said (co)polycarbonate.

12. The multilayer product of claim 1 , wherein the (co)polycarbonate is transparent.

Assignees

• Heuer Helmut-Werner
• Wehrmann Rolf
• Covestro Deutschland Ag

Inventors

• Heuer Helmut-Werner
• Wehrmann Rolf

Classifications

• Y10T428/31507

  Of polycarbonate · CPC title

• B29C47/0009

  Operations & Transport · mapped topic

• C08G64/12

  containing nitrogen · CPC title

• C08J7/123

  Treatment by wave energy or particle radiation (C08J7/18 takes precedence) · CPC title

• C07D209/46 Primary

  with an oxygen atom in position 1 · CPC title