Polyamide compositions having improved optical properties

Patent metadata

Field	Value
Publication number	US-10633516-B2
Application number	US-201615744108-A
Country	US
Kind code	B2
Filing date	Jul 13, 2016
Priority date	Jul 15, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

The invention relates to the use of thermoplastic molding compositions comprising
A) 30 to 99.99 wt % of a thermoplastic polyamide,
B) 0.01 to 10 wt % of a compound of formula I

where
A) represents a

or —O—R 5 radical or

B) represents a

or —O—R 6 radical or

and
Z represents linear or branched C1 to C14 alkylene radicals, unsubstituted or substituted cycloalkylene radicals having 3 to 17 carbon atoms, substituted or unsubstituted aromatic radicals having 6 to 20 carbon atoms,
R 1 to R 10 independently of one another represent linear C1-C14 alkyl radicals, branched C3 to C12 alkyl radicals, unsubstituted or substituted C3-C14 cycloalkyl radicals, unsubstituted or substituted aromatic radicals having 6 to 20 carbon atoms or acetyl radicals,
R 1 and R 2 and also R 3 and R 4 independently of one another, together with the nitrogen as a linking member, form a heteroalkylene radical which may bear one or two keto groups as substituent(s).

First claim

The invention claimed is:

1. A method for producing molded articles comprising the use of a thermoplastic molding composition comprising
A) 30 to 99 wt % of a thermoplastic polyamide,
B) 0.05 to 10 wt % of a compound of formula I

where

A) represents a
and
B) represents a

or A represents an —OR 5 radical and B represents an —OR 6 radical
and
Z represents unsubstituted or substituted cycloalkylene radicals having 3 to 17 carbon atoms or substituted or unsubstituted aromatic radicals having 6 to 20 carbon atoms,
R 1 to R 6 independently of one another represent linear C1-C14 alkyl radicals, branched C3 to C12 alkyl radicals, unsubstituted or substituted C3-C14 cycloalkyl radicals, unsubstituted or substituted aromatic radicals having 6 to 20 carbon atoms or acetyl radicals,
R 1 and R 2 and also R 3 and R 4 , together with the nitrogen as a linking member, form a heteroalkylene radical which bears one keto group as substituent,
C) 0 to 60 wt % of further additives,
wherein the weight percentages for the components A) to C) sum to 100%,
the molded articles having improved haze (measured according to ASTM D1003) and/or improved clarity (measured according to ASTM D1003),
wherein the molded article has a haze value, measured according to ASTM D1003, which is at least 10% lower compared to a reference polymer composition without the component B), measured at a test specimen thickness (sheet) of 1.3 mm, and/or
wherein the molded article has a clarity value, measured according to ASTM D1003, which is at least 10% higher compared to a reference polymer composition without the component B), measured at a test specimen thickness (sheet) of 1.3 mm.

2. The method according to claim 1 , wherein the molding compositions are constructed from
A) 30 to 99 wt %,
B) 0.5 to 10 wt %, and
C) 0 to 60 wt %.

3. The method according to claim 1 in which the radicals R 1 and R 2 , and also R 3 and R 4 as well as R 5 and R 6 are identical.

4. The method according to claim 1 in which the radicals R 1 to R 6 are independently of one another methyl, ethyl, n-propyl, phenyl, or cyclohexyl.

5. The method according to claim 1 , wherein the component B is constructed from the following compounds or mixtures thereof:

6. The method according to claim 1 , wherein Z represents a 1,4-trans-cyclohexylene radical.

7. The method according to claim 1 , wherein the thermoplastic polyamide is polyhexamethylene adipamide, polyhexamethylene sebacamide, polycaprolactam, or copolyamide 6/66.

8. The method according to claim 1 for producing molded articles by laser transmission welding.

9. A molded article obtained according to claim 1 for applications in the electrical, electronics, telecommunications, information technology, computer, sports, medical, automotive, or entertainment sectors.

10. A thermoplastic molding composition comprising
A) 30 to 99 wt % of a thermoplastic polyamide,
B) 0.05 to 10 wt % of a compound of formula I

where

A) represents a
and
B) represents a

or A represents an —OR 5 radical and B represents an —OR 6 radical
and
Z represents unsubstituted or substituted cycloalkylene radicals having 3 to 17 carbon atoms or substituted or unsubstituted aromatic radicals having 6 to 20 carbon atoms,
R 1 to R 6 independently of one another represent linear C1-C14 alkyl radicals, branched C3 to C12 alkyl radicals, unsubstituted or substituted C3-C14 cycloalkyl radicals, unsubstituted or substituted aromatic radicals having 6 to 20 carbon atoms or acetyl radicals,
R 1 and R 2 and also R 3 and R 4 , together with the nitrogen as a linking member, form a heteroalkylene radical which bears one keto group as substituent,
C) 0 to 60 wt % of further additives,
wherein the weight percentages for the components A) to C) sum to 100.

Assignees

• Basf Se

Inventors

• Richter Florian
• Xalter Rainer
• Park Hye Jin

Classifications

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• C08L21/00

  Compositions of unspecified rubbers · CPC title

• C08K7/14

  Glass · CPC title

• C08K5/21

  Urea; Derivatives thereof, e.g. biuret · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title