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Additives (1) |
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Table 4.3.1.3
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Pronunciation
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Subdomain (1st level): |
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Papermaking |
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Subdomain (2nd level): |
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Surface treatments |
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Subdomain (3rd level): |
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Coating |
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Grammatical category: |
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Simple term |
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Grammar notes: |
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Countable |
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Definition: |
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Materials added to pigments and binders in coating colour formulations, in order to modify the handling properties of the dispersion or to impart specific properties to the coating colour or to the finished coated sheet. |
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Definition source: |
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Brewer (2003) |
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Context: |
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Additives
Coating color properties are largely controlled by selecting the types, grades and quantities of the pigments and binders. However, certain properties must be modified or optimized, and therefore, it is necessary to add small quantities of other chemicals to the color (and often to sizing solutions, as well). Addition rates are usually between 0.2 and 2 parts per 100 parts of pigment. These additives function in a variety of ways including:
- dispersants for the pigment suspensions;
- viscosity modifiers, e.g. carboxymethylcellulose and starches;
- crosslinking agents for starch based coatings which increase wet rub resistance, particularly for offset papers, e.g. glyoxal, urea formaldehyde and melamine formaldehyde resins;
- lubricants like calcium stearate and polyethylene based emulsions which assist cutting and slitting and reduce dusting in those operations and in calendering;
- chemicals to modify pH, color, foaming tendencies, resistance to micro-organisms etc. |
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Context source: |
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EN 48 |
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Attestation: |
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2 |
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Contained in: |
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Coating colour |
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Hyponyms: |
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Dispersants, Defoamers, Lubricants, Plasticizers |
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Variants: |
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Coating additives |
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Related terms: |
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Pigments, Binders |
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It:
Additivi (2)
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Degree of reliability IT:
3
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Fr:
Adjuvants (2)
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Degree of reliability FR:
3
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