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New unique color patterns

IP.com Disclosure Number: IPCOM000005233D
Publication Date: 2001-Aug-17
Document File: 2 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

New, unique color patterns can be achieved be a simple method. This method consists of mixing of round plastic pellets with different colors and injection molding of the resulting mixture.

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Title: New unique color patterns.

Abstract

New, unique color patterns can be achieved be a simple method. This method consists of mixing of round plastic pellets with different colors and injection molding of the resulting mixture.

These unique aesthetic effects are simply formed during the molding step and do not require any complicated and expensive machinery. Other simple mixtures of plastic pellets of the same material but with different colors only lead to a final product which color is a mixture of the two starting colors. For example, a mixture of equal parts of yellow and red plastic pellets will lead to an orange product. This is not the case with this new method, which takes advantage of the different vicat temperatures of two thermoplastic materials. Unlike other described methods in the literature, where expensive machinery like calanders have to be used, this only needs a widely available injection molding machine without any further additions or changes in set-up.

The other advantage of this method is the retain of mechanical properties of the used base thermoplastic.

This is achieved by using a high melting polyetherimide in a polyester containing matrix. Polyetherimide has a considerably higher thermal transition temperature than the polymer matrix materials PC, PBT, and ABS. In addition to this, a reasonable miscibility of the polymeric material ensures good mechanical properties. A mixture of ground, colored material of the base polymer matrix with ground, colored particles of polyetherimide can be processed in a molding machine at a temperature setting which allows for the separation of the different colors.

Base color

Red

Yellow

Speckle color

Green

Green

Blue

Blue

Yellow

Red

The colored polyetherimide particles remain in the final product well distributed but not dispersed in the matrix polymer. Thus, considerable color speckles and colored stripes appear in the final part. The colored areas vary randomly from round shaped circles to stripes. Color differences between differently colored areas are huge and can easily be determined by a human observer. The shape and size of the colored areas can easily be altered by changing the temperature settings during the final forming process. Higher temperatures give considerably smaller areas with a more stripe like shape, whereas lower temperatures form bigger areas with a more circle like shape. The overall appearance of the final part will be more "organic" and allows for designers to create colored effects without the need of painting.

Test results show that the mechanical properties of the molded parts with PEI particles are comparable to the ones of the blends without PEI. This ensures use of the final parts in engineering plastic applications where a combination of aesthetic effects with excellent mechanical properties are required.

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