Blocked isocyanates
First Claim
Patent Images
1. In a storage-stable coating composition curable by heat unblocking at 100°
- C. to 120°
C., said composition comprising an active hydrogen-containing compound and a blocked polyisocyanate of the formula;
space="preserve" listing-type="equation">R--Y.sub.mwherein m is an integer greater than 1, Y is a blocking group and R is an m-valent aromatic residue of an isocyanate compound selected from the group consisting of ω
, ω
'"'"'-diisocyanato-1,3-dimethyl benzene, ω
, ω
'"'"'-diisocyanato-1,4-dimethyl benzene, ω
, ω
'"'"'-diisocyanato-diethyl benzene, ω
, ω
'"'"'-diisocyanato-dimethyl toluene, ω
, ω
'"'"'-diisocyanato-diethyl toluene, 1,3-bis-(2-isocyanato-prop-2-yl) benzene, and 1,4-bis-(2-isocyanato-prop-2-yl) benzene or R is an m-valent residue of a polyisocyanate reaction product of an isocyanate and an active hydrogen-containing compound selected from the group consisting of water, a lower molecular weight polyol having a molecular weight less than or equal to 300 and a medium molecular weight polyol having a molecular weight greater than 300 and less than 8000 or R is an m-valent residue of an isocyanurate, the improvement whereby said composition is curable by heat unblocking at 100°
C. to 120°
C., and each Y, which may be the same or different, is ##STR8## wherein R1 is, or, where n is more than 1, each R1, which may be the same or different, is a C1 -C4 alkyl, C1 -C4 alkenyl, phenyl C1 -C4 alkenyl, phenyl, NO2, halogen or a ##STR9## group where R2 is a C1 -C4 alkyl group; and
n is 0, 1, 2 or 3, provided that, when R is an aromatic residue the groups Y are not directly attached to an aromatic nucleus.
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Abstract
A blocked polyisocyanate of the formula
R--Y.sub.m
where R is an m valent aliphatic, cycloaliphatic, heterocyclic or aromatic residue;
each Y, which may be the same or different, is ##STR1## where R1 is, or, when n is more than 1, each R1, which may be the same or different, is an alkyl, alkenyl, aralkyl, N-substituted carbamyl, phenyl, NO2, halogen or ##STR2## group where R2 is a C1 -C4 alkyl group; n is 0, 1, 2 or 3; and
m is an integer greater than 1 is useful in paint compositions.
34 Citations
17 Claims
-
1. In a storage-stable coating composition curable by heat unblocking at 100°
- C. to 120°
C., said composition comprising an active hydrogen-containing compound and a blocked polyisocyanate of the formula;
space="preserve" listing-type="equation">R--Y.sub.mwherein m is an integer greater than 1, Y is a blocking group and R is an m-valent aromatic residue of an isocyanate compound selected from the group consisting of ω
, ω
'"'"'-diisocyanato-1,3-dimethyl benzene, ω
, ω
'"'"'-diisocyanato-1,4-dimethyl benzene, ω
, ω
'"'"'-diisocyanato-diethyl benzene, ω
, ω
'"'"'-diisocyanato-dimethyl toluene, ω
, ω
'"'"'-diisocyanato-diethyl toluene, 1,3-bis-(2-isocyanato-prop-2-yl) benzene, and 1,4-bis-(2-isocyanato-prop-2-yl) benzene or R is an m-valent residue of a polyisocyanate reaction product of an isocyanate and an active hydrogen-containing compound selected from the group consisting of water, a lower molecular weight polyol having a molecular weight less than or equal to 300 and a medium molecular weight polyol having a molecular weight greater than 300 and less than 8000 or R is an m-valent residue of an isocyanurate, the improvement whereby said composition is curable by heat unblocking at 100°
C. to 120°
C., and each Y, which may be the same or different, is ##STR8## wherein R1 is, or, where n is more than 1, each R1, which may be the same or different, is a C1 -C4 alkyl, C1 -C4 alkenyl, phenyl C1 -C4 alkenyl, phenyl, NO2, halogen or a ##STR9## group where R2 is a C1 -C4 alkyl group; and
n is 0, 1, 2 or 3, provided that, when R is an aromatic residue the groups Y are not directly attached to an aromatic nucleus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- C. to 120°
Specification
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Current AssigneeBaxenden Chemicals Ltd. (Lanxess AG)
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Original AssigneeBaxenden Chemicals Ltd. (Lanxess AG)
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InventorsHughes, Anthony H., Topham, Arthur
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Primary Examiner(s)Niebling, John
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Assistant Examiner(s)Mayekar, Kishor
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Application NumberUS08/079,904Time in Patent Office468 DaysField of Search528/45, 528/49, 528/58US Class Current528/45CPC Class CodesC07D 231/12 with only hydrogen atoms, h...C08G 18/10 Prepolymer processes involv...C08G 18/2865 Compounds having only one p...C08G 18/808 MonoaminesC09D 5/4496 characterised by the nature...
