Claims
- 1. A clean room having walls fabricated by building material components connected together forming gaps therebetween and a wet sealing material filling said gaps with said wet sealing material cured to be a hardened sealant of the gaps, the wet sealing material comprising a main ingredient forming a polyurethane resin after curing and an additive; andwherein both the main ingredient and the additive substantially do not release gaseous organic substances.
- 2. The clean room as defined in claim 1, wherein the main ingredient comprises: a prepolymer having isocyanate groups on both terminal ends of a polyether polyol or a polyester polyol; and a diisocyanate of a low molecular weight.
- 3. The clean room as defined in claim 2, wherein the prepolymer is obtained by reaction between a polypropylene oxide as the polyether polyol, and at least one of diphenylmethane diisocyanate and toluene diisocyanate.
- 4. The clean room as defined in claim 2, wherein the low molecular weight diisocyanate is at least one of diphenylmethane diisocyanate (not containing phosphoric acid ester), dicyclohexylmethane diisocyanate, isophoron diisocyanate, xylene diisocyanate and norbornane diisocyanate.
- 5. The clean room as defined in claim 1, wherein the additive includes a lubricant, and wherein a main ingredient of the lubricant is an aliphatic hydrocarbon of not less than 20 carbon atoms.
- 6. The clean room as defined in claim 3, wherein the main ingredient of the lubricant is selected from the group consisting of microcrystalline wax, natural paraffin, synthetic paraffin, polyolefin wax, and mixtures thereof.
- 7. The clean room as defined in claim 1, wherein the additive includes a plasticizer, and wherein a main ingredient of the plasticizer is selected from the group consisting of carboxylic acid esters, polyesters, epoxy series compounds having a molecular weight of not less than 400, and mixtures thereof.
- 8. The clean room as defined in claim 7, wherein the main ingredient of the plasticizer is selected from the group consisting of isononyl phthalate, octyldecyl phthalate, diisodecyl phthalate, lauryl phthalate, myristylyl phthalate, di-2-ethylhexyl azelate, di-2-ethylhexyl sebacate, tris-2-ethylhexyl trimellitate, trioctyl trimellitate, trinonyl trimellitate, tridecyl trimellitate, polyester obtained by polycondensation of adipic acid, azelaic acid, sebacic acid or phthalic acid with glycol or glycerine, epoxy fatty acid ester, and epoxidized oil.
- 9. The clean room as defined in claim 1, wherein the additive includes an antioxidant, and wherein a main ingredient of the antioxidant is a phenolic compound having a molecular weight of not less than 300.
- 10. The clean room as defined in claim 9, wherein the main ingredient of the antioxidant is selected from the group consisting of stearyl-β-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2,2′-methylene-bis-(4-methyl-6-t-butylphenol), 2,2′-methylene-bis-(4-ethyl-6-t-butylphenol), 4,4′-thiobis-(3-methyl-6-t-butylphenol), 4,4′-butylidene-bis-(3-methyl-6-t-butylphenol), 1,1,3-tris-(2-methyl-4-hydroxy-5-t-butylphenyl)butane, 1,3,5-trimethyl-2,4,6-tris-(3,5-di-t-butyl-4-hydroxybenzyl)benzene, tetrakis(methylene-3-(3′,5′-di-t-butyl-4′-hydroxyphenyl)propionate)methane, bis-(3,3′-bis-(4′-hydroxy-3′-t-butylphenyl)butyric acid) glycol ester, tochophenol, and mixtures thereof.
- 11. A clean room having walls fabricated by building material components connected together forming gaps therebetween and a wet sealing material filling said gaps with said wet sealing material cured to be a hardened sealant of the gaps, the wet sealing material forming a polyurethane resin after curing, and formed by compounding at least any one of a lubricant, plasticizer and antioxidant as an additive to a main ingredient in the wet sealing material, wherein each of the additive and the wet sealing material main ingredient substantially do not release any gaseous organic substances into the clean room; andthe lubricant being a first main component in the additive, wherein said first component consists essentially of aliphatic hydrocarbons of not less than 20 carbon atoms; the plasticizer being a second main component in the additive, wherein the second main component is at least any one of carboxylic acid esters, polyesters and epoxy series compounds which have a molecular weight of not less than 400; and the antioxidant being a third main component in the additive, wherein the third main component consists essentially of phenolic compounds having a molecular weight of not less than 300.
- 12. A local facility into which clean air is introduced and having walls fabricated by building material components connected together forming gaps therebetween and a wet sealing material filling said gaps with said wet sealing material cured to be a hardened sealant of the gaps, whereinthe wet sealing material consisting of a main ingredient to form a polyurethane resin after curing and an additive; and both the main ingredient and the additive substantially do not release gaseous, organic substances into the local facility.
- 13. The local facility as defined in claim 12, wherein the additive comprises at least one of a lubricant, a plasticizer and an antioxidant, wherein the lubricant is a first main component in the additive, wherein said first main component consists essentially of aliphatic hydrocarbons of not less than 20 carbon atoms; the plasticizer is a second main component in the additive, wherein the second main component is at least any one of carboxylic acid esters, polyesters and epoxy series compounds which have a molecular weight of not less than 400; and the antioxidant is a third main component in the additive, wherein the third main component consists essentially of phenolic compounds having a molecular weight of not less than 300.
Priority Claims (6)
Number |
Date |
Country |
Kind |
7-192091 |
Jul 1995 |
JP |
|
7-192092 |
Jul 1995 |
JP |
|
7-192093 |
Jul 1995 |
JP |
|
8-174642 |
Jul 1996 |
JP |
|
8-174643 |
Jul 1996 |
JP |
|
8-174644 |
Jul 1996 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a divisional of U.S. application Ser. No. 09/090,199, filed Jun. 4, 1998, which is itself a divisional of U.S. application Ser. No. 08/685,428, filed Jul. 24, 1996, now U.S. Pat. No. 5,869,560.
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