PRODUCTS WITH IMPROVED NON-FLAMMABILITY
The present invention relates to polycarbonate compositions for producing halogen-free moulded parts for use in public facilities which meet the corresponding fire protection regulations and standards. The present invention also relates to the use of halogen-free polycarbonate compositions for producing moulded parts, particularly seating and/or parts of seating, e.g. seat shells, which are flame-retardant and meet the standards for use in public buildings, as well as the moulded parts themselves.
1 .- 10 . (canceled)
11 . A process to produce a molding which passes the UNI 9177 class 1 requirement and/or the requirement of the Swiss BKZ rating 5.3 which comprises compounding a composition comprising:
A) 96.00 wt % to 99.98 wt % of at least one polycarbonate,
B) 0.01 wt % to 1.00 wt % of one or more mold release agents,
C) 0.01 wt % to 1.00 wt % of one or more heat stabilizers and/or processing stabilizers,
D) 0.00 wt % to 2.00 wt % of at least one or more UV absorbers,
E) 0.00000 wt % to 5.00000 wt % of one or more colorants selected from the group of organic and inorganic colorants and carbon black, based on the total amount of the sum of components A-D,
F) 0.0 wt % to 5.0 wt % of one or more further additives, different from components B)-E), based on the total amount of the sum of components A-D,
the components A-D adding up to 100 wt %, and
where the composition is free from phosphorus-based flame retardants, from alkali metal and alkaline earth metal salts of aliphatic and aromatic sulfonic acid, sulfonamide and sulfonimide derivatives, sodium or potassium pentachlorobenzoate, sodium or potassium 2,4-dichlorobenzoate, sodium or potassium 2,4,6-trichlorobenzoate, trisodium or tripotassium hexafluoroaluminate, disodium or dipotassium hexafluorotitanate, disodium or dipotassium hexafluorosilicate, disodium or dipotassium hexafluorozirconate, sodium or potassium tetrafluoroborate.
12 . The process as claimed in claim 11 , wherein component C) is selected from the group of phosphines, phosphites, and phenolic antioxidants and also mixtures thereof.
13 . The process as claimed in claim 11 , wherein the composition is halogen-free.
14 . The process as claimed in claim 11 , wherein the composition is free from phosphorus based flame retardants.
15 . The process as claimed in claim 11 , wherein the polycarbonate has an average molecular weight M w of 29 000 to 32 000 g/mol.
16 . The process as claimed in claim 11 , wherein component B) is a mixture of pentaerythritol tetrastearate and glycerol monostearate.
17 . The process as claimed in claim 11 , wherein the composition has a light transmittance of at least 83%, measured according to ISO 13468-2.
18 . The process as claimed in claim 11 , wherein the composition is translucent or nontransparent, measured according to ISO 13468.
19 . A molding with enhanced flame retardancy, meeting at least one standard from the group of UNI 9177 class 1 and the Swiss BKZ rating 5.3, produced from a composition comprising
A) 96.00 wt % to 99.9 wt % of at least one polycarbonate,
B) 0.01 wt % to 1.00 wt % of one or more mold release agents,
C) 0.01 wt % to 1.00 wt % of one or more heat stabilizers and/or processing stabilizers,
D) 0.00 wt % to 2.00 wt % of at least one or more UV absorbers,
E) 0.00000 wt % to 5.00000 wt % of one or more colorants selected from the group of organic and inorganic colorants and carbon black, based on the total amount of the sum of components A-D,
F) 0.0 wt % to 5.0 wt % of one or more further additives, different from components B)-E), based on the total amount of the sum of components A-D,
the components A-D adding up to 100 wt %, and
where the composition is free from phosphorus-based flame retardants, from alkali metal and alkaline earth metal salts of aliphatic and aromatic sulfonic acid, sulfonamide and sulfonimide derivatives, sodium or potassium pentachlorobenzoate, sodium or potassium 2,4-dichlorobenzoate, sodium or potassium 2,4,6-trichlorobenzoate, trisodium or tripotassium hexafluoroaluminate, disodium or dipotassium hexafluorotitanate, disodium or dipotassium hexafluorosilicate, disodium or dipotassium hexafluorozirconate, sodium or potassium tetrafluoroborate.
20 . The molding as claimed in claim 19 , wherein the molding is a chair or a seat shell.
21 . The molding as claimed in claim 19 , wherein component C) is selected from the group of phosphines, phosphites, and phenolic antioxidants and also mixtures thereof.
22 . The molding as claimed in claim 19 , wherein the composition is halogen-free.
23 . The molding as claimed in claim 19 , wherein the composition is free from phosphorus-based flame retardants.
24 . The molding as claimed in claim 19 , wherein the polycarbonate has an average molecular weight M w of 29 000 to 32 000 g/mol.
25 . The molding as claimed in claim 19 , wherein component B) is a mixture of pentaerythritol tetrastearate and glycerol monostearate.
26 . The molding as claimed in claim 19 , wherein the composition has a light transmittance of at least 83%, measured according to ISO 13468-2.
27 . The molding as claimed in claim 19 , wherein the composition is translucent or nontransparent, measured according to ISO 13468.