2. Properties and features

2.1 Mechanical resistance

Polymers come in two forms:

the amorphous form;
semi-crystalline form.

Coloring amorphous polymers: this does not generally pose any problems in terms of mechanical strength. The pigment molecules are trapped in the macromolecular network without modifying it.

Coloration of crystalline polymers: when polymers are semi-crystalline, two cases can occur:

the colouring is based solely on mineral pigments; in this case, there should be no major problem since the pigments are also crystalline;
coloring is carried out with organic pigments; the...

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Properties and features

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Mineral pigments/organic pigments comparison

Bibliography

(1) - BROWN (H.E.) - Zinc Oxide – Properties and Applications - IIZRO, New York (1976).
(2) - BENZING (G.) et al - Pigmente und Farbstoffe für die lackindustrie - Expert verlag, Ehningen, Allemagne (1992).
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Standards and norms

Testing of pigments (Part 1 et Part 2). - DIN 53235 -
Testing in plasticised PVC – Composition and preparation of basic mixture. - DIN 53775 -
Colouring materials ; classification according to coloristic and chemical aspects. - DIN 55944 -
Plastics – Methods of Exposure to laboratory light sources. - DIN 53387 -
Printing, printing inks and substrates – Assessment of light fastness...

Regulations

Circular N° 176 du 2/12/1959 relative aux pigments et colorants des matières plastiques et emballages.

Council Directive 91/338/EEC of June 18, 1991 amending for the tenth time Directive 76/769/EEC on the approximation of the laws, regulations and administrative provisions of the Member States relating to restrictions on the marketing and use of certain dangerous substances and preparations....