Laser-transparent polyesters with inorganic salts
AssigneeBASF SE
InventorsRebekka von Benten, Peter Eibeck
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Abstract
Use of thermoplastic molding compositions comprising, as essential components, A) from 29 to 99.95% by weight of a polyester, B) from 0.25 to 3.0% by weight of alkali metal oxoaluminates, or alkali metal salts of cyanic acid, isocyanic acid, thiocyanic acid, or metaboric acid, or a mixture of these, based on 100% by weight of A) and B), and also moreover C) from 0 to 70% by weight of further additives, where the total of the % by weight values for A) to C) is 100%, for producing laser-transparent moldings of any type.
Claims9
A process for producing a laser-transparent molding which comprises utilizing a thermoplastic molding composition comprising, as essential components,
- A) from 29 to 99.95% by weight of a polyester,
- B) from 0.25 to 3.0% by weight of alkali metal oxoaluminates, or alkali metal salts of cyanic acid, isocyanic acid, or metaboric acid, or a mixture of these,
- based on 100% by weight of A) and B), and also moreover
- C) from 0 to 70% by weight of further additives, where the total of the % by weight values for A) to C) does not exceed 100%;
- wherein the laser transparency of the molding is at least 33% (measured at 1064 nm on a molding of thickness 2 mm).
A process for producing welded moldings, which comprises using laser transmission welding to bond laser-transparent moldings to laser-absorbent moldings, wherein the laser-transparent molding comprises a thermoplastic molding composition comprising, as essential components,
- A) from 29 to 99.95% by weight of a polyester,
- B) from 0.25 to 3.0% by weight of alkali metal oxoaluminates, or alkali metal salts of cyanic acid, isocyanic acid, or metaboric acid, or a mixture of these,
- based on 100% by weight of A) and B), and also moreover
- C) from 0 to 70% by weight of further additives, where the total of the % by weight values for A) to C) does not exceed 100%;
- wherein the laser transparency of the laser transparent molding is at least 33% (measured at 1064 nm on a molding of thickness 2 mm).
Dependencies are inferred from the claim text.