Use of salts in combination with halogenated phthalimides for flameproof finishing of glass fibre-containing polycarbonate moulded members
AssigneeBayer Aktiengesellschaft
InventorsKlaus Horn, Jurgen Kirsch, Richard Weider, Hugo Obermann, Dieter Freitag, Karsten-Josef Idel
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Abstract
The invention relates to use of salts of sulphonic acids, phosphonic acids and/or carboxylic acids in combination with halogenated phthalimides for additional processing of glass fibre-containing polycarbonate moulded members.
Claims7
A method of preparing flame-resistant, glass fibre-containing polycarbonate resins from glass fibre-containing polycarbonate moulded members, characterised in that
- either glass fibre-containing polycarbonate moulded members are shredded and then processed with salts of sulphonic acids, phosphonic acids and/or carboxylic acids and with halogenated phthalimides and optionally with polycarbonate resin and/or glass fibres together in known manner via the melt to obtain glass fibre-containing flame-resistant polycarbonate resin,
- or glass fibre-containing polycarbonate moulded members already containing incorporated salts of sulphonic acids, phosphonic acids and/or carboxylic acids are shredded and then processed with halogenated phthalimides and optionally with polycarbonate resin and/or glass fibres together in known manner via the melt to obtain glass fibre-containing flame-resistant polycarbonate resin,
- or glass fibre-containing polycarbonate moulded members already containing incorporated salts of sulphonic acids, phosphonic acids and/or carboxylic acids and halogenated phthalimides are shredded and then optionally processed with polycarbonate resin and/or glass fibres together in known manner via the melt to obtain glass fibre-containing flame-resistant polycarbonate resin.
A method of preparing flame-resistant, glass fiber containing polycarbonate composition from recycled glass fiber-containing polycarbonate molded members comprising
- (i) shredding glass fiber-containing polycarbonate molded members to produce shredded material, and
- (ii) adding to said shredded material in the molten state
- (a) at least one salt selected from the group consisting of alkali-metal, alkaline earth metal and ammonium salts of an acid selected from the group consisting of sulphonic acid, phosphonic acid and carboxylic acid and
- (b) a halogenated phthalimide,
- in sufficient amounts to render the composition flame retardance of V-0 for specimens having a thickness of 1.6 mm in accordance with UL-94.
Dependencies are inferred from the claim text.