Aqueous polyurethane composition for low gloss coatings

Details Aqueous polyurethane composition for low gloss coatings Aqueous polyurethane composition for low gloss coatings

2003-12-16

2008-10-21

McClendon, Sanza L (Department: 1796)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S800000, C524S839000, C528S044000, C528S048000, C528S059000, C528S060000, C528S061000, C528S065000, C528S067000, C528S071000, C528S080000, C528S083000, C528S085000, C428S423100, C427S372200

Reexamination Certificate

active

07439299

ABSTRACT:
An aqueous coating composition having a 60° gloss of ≦40 upon drying comprising a self-crosslinkable polyurethane obtained by the reaction of:(A) an isocyanate-terminated pre-polymer formed from components which comprise(i) 5 to 65 wt % of at least one organic polyisocyanate;(ii) 0.1 to 6 wt % of at least one polyol containing ionic or potentially ionic water-dispersing groups, having two or more isocyanate-reactive groups and having a molecular weight in the range of from 100 up to 500 g/mol;(iii) 0 to 30 wt % of at least one polyol containing water-dispersing groups, having two or more isocyanate-reactive groups and having a molecular weight in the range of from 500 to 6000 g/mol;(iv) 10 to 80 wt % of at least one polyol containing crosslinkable groups, having two or more isocyanate-reactive groups and having a molecular weight in the range of from 150 to 6000 g/mol;(v) 10 to 70 wt % of at least one polyol not comprised by (iii) or (iv) having two or more isocyanate-reactive groups and having a molecular weight in the range of from 500 to 6000 g/mol;(vi) 0 to 50 wt % of at least one component not comprised by (i), (ii), (iii),(iv) or (v); where (i), (ii), (iii), (iv), (v) and (vi) add up to 100 wt %; and where the NCO:OH ratio is in the range of from 1.1:1.0 to 10.0:1.0; and(B) at least one active-hydrogen chain extending compound.

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Machine Translation of EP 709414 A (1996).

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