Pigment for warpage-free polyolefins coloration

Details Pigment for warpage-free polyolefins coloration Pigment for warpage-free polyolefins coloration

2000-08-11

2003-10-28

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...

C008S575000

Reexamination Certificate

active

06638996

ABSTRACT:

This invention relates to the use of a pigment for the warpage-free coloration of polyolefins.
Unexpected shrinkage and warpage problems can occur when organic pigments are used for the coloration of polyolefins, especially high density polyethylene. This may be due to changes in crystallization behaviour due to the presence of pigments. A number of studies have shown that pigments can affect both the size of the crystallites and the rate of crystallization by acting as nucleating agents, inducing crystallization at higher temperatures a than expected.
BACKGROUND OF THE INVENTION
All these aspects have an important commercial issue. For example the coloration of bottle crates is a very important market for a pigment producer. A pigment has to fulfill an important condition when used in high density polyethylene application: it must not influence the crystallization process of the polymer. Such an influence can cause shrinkage or warpage, showing deformations of the injected article and deterioration of the mechanical properties.
In order to avoid this problem, when using organic pigment for the coloration of polyolefins, surface treatments have been developed in order to modify the surface of the pigment precipitation on the surface of the organic particules of a thin layer of a metal oxide (e.g. zirconium, silicium or aluminium) or adsorption or precipitation of some polar polymers (polyacrylates or cellulose derivatives) on the pigment surface. However these treatments are not always efficient.
It has now been found that thiazine-indigo pigments of formula (I) and of formula (II) do not provoke warpage when used in high density polyethylene.
in which X stands for Cl or CH
3
wherein R is phenyl or C
12
H
25
.
Other derivatives of this family have also been tested, for example the two pigments of formula (Ill) and (IV) and the pigment of formula (II) with R=p-C
6
H
4
CF
3
, but they show warpage when used in high density polyethylene.
The invention, therefore, resides in the use of a pigment of formula (I) or (II) for the coloration of polyolefins which do not warp and provides warpage-free polyolefins, more preferably high density polyethylene (HDPE), which have been colored with a pigment of formula (I) or (II).
When coloring polyolefins with the pigment of formula (I) the usual amounts can be used, i.e. from 0.01 to 30% by weight, preferably from 0.1 to 10% by weight based on the material to be colored.


REFERENCES:
patent: 3803139 (1974-04-01), Kaul
patent: 4602961 (1986-07-01), Hari
patent: 5482984 (1996-01-01), Chetcuti
patent: 6200378 (2001-03-01), Piastra et al.
patent: 25 36 120 (1977-03-01), None
patent: 98/32800 (1998-07-01), None
EPO Search Report for application No. 00117000, Dec. 4, 2000.
U.S. patent application Ser. No. 09/649,531, filed Aug. 28, 2000, Sidqui.
English abstract for DE 2536120, Mar. 3, 1977.

Affiliated with

Also associated with

Rating

Pigment for warpage-free polyolefins coloration does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pigment for warpage-free polyolefins coloration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pigment for warpage-free polyolefins coloration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3135755