Composition containing thermoplastic polymers

Details Composition containing thermoplastic polymers Composition containing thermoplastic polymers

2001-10-23

2003-10-14

Sanders, Kriellion A. (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S100000, C524S153000, C524S154000, C524S291000, C428S412000, C428S480000

Reexamination Certificate

active

06632864

ABSTRACT:

The present invention relates to compositions containing thermoplastic polymers and benzotriazoles as UV absorbers and products produced therefrom. The products according to the invention are preferably multilayer sheets in which one or both of the outer layers consist of the compositions according to the invention.
Sheets containing thermoplastic polymers are known.
Polycarbonate sheets are known for example from EP-A 0 110 221 and are provided for a plurality of applications. They are produced, for example, by extrusion of poly-carbonate-containing compositions and optionally coextrusion with polycarbonate-containing compositions which contain an increased proportion of UV absorbers.
EP-A 0 320 632 and EP-A 0 247 480 describe coextruded sheets made of polycarbonate-containing compositions which contain a low volatile UV absorber based on substituted benzotriazoles.
DE-A 1 670 951 teaches that dimeric benzotriazoles are preferred to the monomeric benzotriazoles due to their considerably lower volatility in the polycarbonate.
A problem which occurs during extrusion of such sheets is the deposition of volatile components from the polycarbonate-containing compositions or, in general thermoplastic polymers on the calibrator (for multi-wall sheets) or on the calender rolls (for solid sheets) which can lead to surface defects. Volatile components are, for example, UV absorbers and other low molecular components of the compositions.
The disadvantage of the sheets according to the prior art is that the surface of the sheets is adversely affected during prolonged extrusion times owing to the above-mentioned evaporations from the melt of the compositions containing polycarbonate or general thermoplastic polymers, particularly during coextrusion.
The increased evaporation of the UV absorber from the melt of the compositions containing polycarbonate or general thermoplastic polymers leads to deposition on the calibrator or the calender rolls and finally to the formation of defects of the sheet surface (for example white spots, undulation, etc.). In addition, the rubbed-off polycarbonate or the rubbed-off thermoplastic polymers on the calibrator generally lead to pulverulent depositions on the coextruded polycarbonate sheets or sheets of thermoplastic polymers.
The object of the present invention is therefore to optimize compositions containing thermoplastic polymers so that the good surface quality of the extruded sheets can be retained with constant protection against UV radiation during extrusion of the compositions to form sheets, even with a prolonged continuous mode of operation.
According to the invention, the object also consists in providing products which can be obtained from the compositions according to the invention.
It has surprisingly been found that compositions which, in addition to thermoplastic polymers, also contain two different UV absorbers in a specific weight ratio to one another achieve the object according to the invention. Products which can be obtained from these compositions also achieve the object according to the invention.
The object according to the invention is achieved by the use of mixtures containing 0.1 to 15 parts by weight of one or more different compounds of Formula (I)
Wherein
R
1
and R
2
are identical or different and represent H, halogen, C
1
- to C
10
-alkyl, C
5
- to C
10
-cycloalkyl, C
7
- to C
13
-aralkyl, C
6
- to C
14
-aryl, —OR
5
or —(CO)—O—R
5
, where
R
5
is H or C
1
- to C
4
-alkyl,
R
3
and R
4
are identical or different and represent H, C
1
- to C
4
-alkyl, C
5
- to C
6
-cycloalkyl, benzyl or C
6
- to C
14
-aryl,
m is 1, 2 or 3 and
n is 1, 2, 3 or 4,
and 0.0001 to 0,4, preferred 0.001 to 0.4 parts by weight of one or more different compounds of Formula (II):
wherein
R and X are identical or different and are H or alkyl or alkylaryl,
in compositions containing thermoplastic polymers for improving the extrusion properties to the extent that, when extruding the compositions to form sheets, a good surface quality of the extruded sheets is obtained.
The object according to the invention is also achieved by the use of mixtures containing
0.1 to 15 parts by weight
of one or more different compounds of Formula (III):
wherein
R
1
and R
2
are identical or different and represent H, halogen, C
1
- to C
10
-alkyl, C
5
- to C
10
-cycloalkyl, C
7
- to C
13
-aralkyl, C
6
- to C
14
-aryl, —OR
5
or —(CO)—O—R
5
, where
R
5
is H or C
1
- to C
4
-alkyl,
m is 1, 2 or 3 and
n is 1, 2, 3 or 4,
the bridge represents
p is equal to 0, 1, 2, or 3,
q is an integer from 1 to 10,
Y is —CH
2
—CH
2
—, —(CH
2
)
3
—, —(CH
2
)
4
—, —(CH
2
)
5
—, —(CH
2
)
6
—, or CH(CH
3
)—CH
2
— and
R
10
and R
11
are identical or different and represent H, C
1
- to C
4
-alkyl, C
5
- to C
6
-cycloalkyl, benzyl or C
6
- to C
14
-aryl
and 0.0001 to 0,4 preferred to 0,4 0.001 to 0.4 parts by weight of one or more different compounds of above-mentioned Formula (II),
in compositions containing thermoplastic polymers for improving the extrusion properties to the extent that, when extruding the compositions to form sheets, a good surface quality of the extruded sheets is obtained.
The use of mixtures of compounds of Formula (I) and (II) or (III) and (II) in the sense of the above paragraphs does not inevitably mean that the compounds of Formula (I) and (II) or (III) and (II) must initially be mixed with one another before they are used to stabilize thermoplastic polymers against UV radiation. Any use which leads to compounds of Formula (I) and compounds of Formula (II) or compounds of Formula (III) and compounds of Formula (II) being simultaneously effective in thermoplastic polymers for UV protection is possible according to the invention. For example, the thermoplastic polymers can initially be supplied with compounds of Formula (II) and then compounds of Formula (I).
The object according to the invention is also achieved by a composition containing thermoplastic polymers and 0.1 to 15 wt. %, preferably 0.11 to 10 wt. %, particularly preferably 0.13 to 8 wt. %,
one or more different compounds of Formula (I),
and 0.0001 to 0,4 wt. %, preferred 0.001 to 0.4 wt. %, preferably 0.0015 to 0.35 wt. %, particularly preferably 0.002 to 0.3 wt. %,
one or more different compounds of Formula (II).
The object according to the invention is also achieved by a composition containing
thermoplastic polymers and 0.1 to 15 wt. %, preferably 0.11 to 10 wt. %, particularly preferably 0.13 to 8 wt. %,
one or more different compounds of general Formula (III)
and 0.0001 to 0,4 wt. %, preferred 0.001 to 0.4 wt. %, preferably 0.0015 to 0.35 wt. %, particularly preferably 0.002 to 0.3 wt. %
one or more different compounds of Formula (II).
Of the compounds of Formulae (I), (II) and (III) those where
R
1
=H, R
2
=C
1
- to C
8
-alkyl, particularly R
2
=isooctyl, R
3
=H, R
4
=H, m=1, n=4, R=H or 2-butyl or tert.butyl or —C(CH
3
)
2
-phenyl, X=C
1
- to C
8
-alkyl or —C(CH
3
)
2
-phenyl or isooctyl, p=0, 1, 2 or 3, q=1 to 8, Y=—(CH
2
)
6
or —(CH
2
)
2
, R
10
=H and R
11
=H.
A composition in which the sum of thermoplastic polymers and compounds according to Formula (I) and compounds according to Formula (II) and compounds according to Formula (III) is 50 to 100 wt. % is preferred.
According to the invention, any thermoplastic polymers can be used. Thermoplastic polymers selected from the group consisting of polycarbonate, polyester, polymethylmethacrylate, transparent polyvinyl chloride, transparent polystyrene, SAN and high impact polystyrene are preferred.
Polyester, in particular polyethylene terephthalate (PET) and copolyester made of terephthalic acid, isophthalic acid, glycol and cyclohexane-1,4-dimethanol (for example PETG) are particularly preferred.
Also particularly preferred is polycarbonate, which is selected from the group consisting of bisphenol A homopolycarbonate and copolycarbonates based on the two monomers bisphenol A and 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane.
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