1. A waterborne coating composition comprising:
(a) a carboxylic acid functional polyacrylate having a calculated Tg of greater than 50\xb0 C. that is a reaction product of reactants comprising:
(a1) at least 50% by weight, based on the total weight of the reactants, of a hardening vinyl aromatic monomer selected from the group consisting of dimethylstyrene, 2,5-dimethylstyrene, 3,4-dimethylstyrene, 3,5-dimethylstyrene, 2-ethylstyrene, \u03b1-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-methoxystyrene and styrene;
(a2) a plasticizing ethylenically unsaturated monomer that does not include carboxylic acid or hydroxyl groups selected from the group consisting of methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, iso-butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, n-hexyl methacrylate, n-octyl methacrylate, 2-ethylhexyl methacrylate, decyl methacrylate, dodecyl methacrylate; and
(a3) a carboxylic-acid functional ethylenically unsaturated monomer selected from the group consisting of (meth)acrylic acid, maleic acid, maleic anhydride, fumaric acid, crotonic acid, maleic acid monoalkyl esters, fumaric acid monoalkyl esters, itaconic acid and propylacrylic acid; and
(b) a hydrophilic polycarbodiimide,
wherein: (i) the ratio of carbodiimide groups to carboxylic acid groups in the composition is greater than 0.2:1, and (ii) the composition is substantially free of isocyanate functionality; and (iii) the carboxylic acid groups of the polyacrylate are base-neutralized before, during or after the reaction.
2. The coating composition of claim 1, wherein the calculated Tg is at least 60\xb0 C.
3. The coating composition of claim 2, wherein the calculated Tg of the polyacrylate is at least 65\xb0 C.
4. The coating composition of claim 3, wherein the calculated Tg is at least 70\xb0 C.
5. The coating composition of claim 1, wherein the composition has a viscosity at 23\xb0 C. of less than 1000 cPs.
6. The coating composition of claim 1, wherein the reactants further comprise:
(a4) a hydroxyl functional ethylenically unsaturated monomer.
7. The coating composition of claim 1, wherein (a1) comprises styrene in an amount of at least 80% by weight, based on the total weight of reactant (a1).
8. The coating composition of claim 1, wherein the sum of reactants (a1) and (a3) comprises at least 70% by weight, based on the total weight of reactants used to make the polyacrylate.
9. The coating composition of claim 6, comprising:
(a1) 50 to 85% by weight styrene;
(a2) 5 to 30% by weight of n-butyl acrylate, ethyl acrylate andor 2-ethylhexyl acrylate;
(a3) 1 to 5% by weight of acrylic acid andor methacrylic acid;
(a4) 2 to 30% by weight of hydroxypropyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate andor hydroxyethyl acrylate,
wherein the sum of the % by weights of(a1) to (a4) is 100.
10. The coating composition of claim 1, wherein the carboxylic acid functional polyacrylate and the hydrophilic polycarbodiimide are present in relative amounts such that a ratio of carbodiimide groups to carboxylic acid groups in the composition is at least 0.8 to 1.
11. The coating composition of claim 1, comprising:
(i) at least 70% by weight of the base-neutralized carboxylic acid functional polyacrylate; and
(ii) at least 3% by weight of the aliphatic polycarbodiimide,
wherein the weight percents are based on the total weight of resin solids in the coating composition.
12. The coating composition of claim 1, wherein the composition comprises no more than 0.2 equivalents of free isocyanate groups per equivalents of any isocyanate-reactive groups.
13. A method of using the coating composition of claim 1, comprising:
(A) applying the composition to a substrate; and
(B) allowing the composition to cure at ambient temperature to form a cured coating, wherein the substrate comprises a wall, a chalkboard or a blackboard andor a material comprising a cellulosic material, fiber board, particle board, andor gypsum board.
14. A kit comprising:
(a) the coating composition of claim 1; and
(b) a marker pen.
15. A method of using the coating composition of claim 1, comprising:
(A) applying the composition to a substrate; and
(B) allowing the composition to cure at ambient temperature to form a cured coating, wherein the substrate is a frame of an architectural article.
16. The coating composition of claim 1, wherein the base is selected from the group consisting of ammonia, triethylamine, dimethylethanolamine, N-methylmorpholine, dimethyl isopropylamine, N-methyldiethanolamine, triethanolamine, aminomethyl-1-propanol, dimethylisopropanolamine, sodium hydroxide solution and potassium hydroxide solution.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sensor module package comprising a housing element with an opening to a sensor cavity for allowing outside air to reach a sensor device positioned in the sensor cavity for sensing a characteristic of the outside air, sensor electronics connected to the sensor device for providing an output signal, the sensor device and sensor electronics being positioned on a substrate, characterized in that the sensor cavity is formed by at least a cavity part of the substrate, at least a part of the housing element and the opening and the sensor electronics are positioned outside of the cavity.
2. A sensor module package according to claim 1, in which the sensor device is positioned on the cavity part of the substrate.
3. A sensor module package according to claim 1, in which a sealing member is provided between the housing element and the substrate.
4. A sensor module package according to claim 1, in which opening is provided with a semi-permeable membrane allowing outside air to enter the sensor cavity.
5. A sensor module package according to claim 1, in which the sensor electronics are positioned on a side of the substrate opposing the sensor cavity.
6. A sensor module package according to claim 1, in which the housing element comprises locking members for locking the substrate in the housing.
7. A sensor module package according to claim 1, in which the sensor module package further comprises a cover member, arranged to seal off an electronics cavity formed by the housing element, the substrate and the cover member.
8. A sensor module package according to claim 7, in which the cover member comprises extending members for pressing the substrate in the housing element.
9. A sensor module package according to claim 7, in which the cover member comprises a mechanical fixing element for mounting the sensor module package in a vehicle.