Process for producing surface-sealed hollow glass containers having a high use strength
First Claim
1. A process for producing a surface-sealed hollow glass container, comprising the following sequential steps:
- a) preparing a composition comprising the following components (I) and (II);
(I) a trialkoxysilane, a dialkoxysilane, a tetraalkoxysilane or mixtures thereof, or a hydrolysis or a condensation product thereof, and (II) a water-soluble or water-dispersible mixture of a polyol and a crosslinker;
followed by the steps of b) coating the surface of a hollow glass container with said composition as prepared in step a);
c) followed by the step of crosslinking the coating of the resulting coated hollow glass container by heating the coated hollow glass container at a temperature of 100 to 350°
C.
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Accused Products
Abstract
A process for producing surface-sealed hollow glass containers, the hollow glass containers are, in the production process in the region of the exit from the annealing lehr which is located downstream of a machine for producing hollow glass containers, coated by means of a water-based cold end coating composition comprising at least the following components:
I. a trialkoxysilane, a dialkoxysilane and/or a tetralkoxysilane or their hydrolysis and/or condensation products and also
II. a water-soluble or water-dispersible mixture of a polyol and a crosslinker,
wherein the applied layer of the cold end coating composition is subsequently subjected to a crosslinking step. The hollow glass containers produced in this way have an improved strength.
30 Citations
19 Claims
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1. A process for producing a surface-sealed hollow glass container, comprising the following sequential steps:
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a) preparing a composition comprising the following components (I) and (II);
(I) a trialkoxysilane, a dialkoxysilane, a tetraalkoxysilane or mixtures thereof, or a hydrolysis or a condensation product thereof, and (II) a water-soluble or water-dispersible mixture of a polyol and a crosslinker;
followed by the steps ofb) coating the surface of a hollow glass container with said composition as prepared in step a);
c) followed by the step of crosslinking the coating of the resulting coated hollow glass container by heating the coated hollow glass container at a temperature of 100 to 350°
C.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
(III) a silicon-free component selected from the group consisting of (a) a wax, (b) a partial fatty acid ester, (c) a fatty acid, and (d) a surfactant.
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5. The process of claim 4, wherein the composition further comprises:
(IV) a colorant selected from the group consisting of organic pigments, inorganic pigments and organic dyes.
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6. The process of claim 1, wherein the composition further comprises:
(IV) a colorant selected from the group consisting of organic pigments, inorganic pigments and organic dyes.
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7. The process of claim 1, wherein I is a water-based organopolysiloxane-containing composition prepared from:
(a) Q mol of an alkoxysilane bearing functional groups and having the formula
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8. The process of claim 7, wherein an average of at least 2.4 alkoxy groups OR*, OR**, OR*** and OR**** are present per silicon atom in the mixture of the silanes I to IV.
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9. The process of claim 7, wherein the water-based organopolysiloxane-containing composition is prepared by mixing the silane composition comprising compounds of the formulae I to IV with water and allowing the mixture to stand at room temperature for at least 3 hours.
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10. The process of claim 7, wherein the water-based organopolysiloxane-containing composition is prepared by admixing the silane composition comprising compounds of the formulae I to IV with from 0.5 to 30 mol of water per mol of alkoxysilanes used and removing the alcohol formed in the reaction by distillation.
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11. The process of claim 1, wherein the crosslinker is an amino resin or a blocked polyisocyanate.
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12. The process as of claim 1, further comprising coating the surface of the hollow glass container with a hot end coating.
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13. The process of claim 5, wherein the composition comprises:
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from 0.05 to 20% by weight of I;
from 0.1 to 5% by weight of II;
from 0 to 5% by weight of III; and
from 0 to 10% by weight of IV.
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14. The process of claim 1, wherein the composition contains up to 10% by weight of organic cosolvents.
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15. The process of claim 1, wherein the temperature of the glass surface when the coating composition is applied is 30 to 150°
- C.
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16. The process of claim 15, wherein the temperature of the glass surface is 70 to 110°
- C.
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17. The process of claim 1, wherein the crosslinking is conducted at a temperature of from 150 to 270°
- C.
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18. The process of claim 17, wherein the crosslinking is conducted at a temperature of from 170 to 230°
- C.
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19. A hollow glass container produced by the process of claim 1.
Specification