Patent US4446185A successfully refreshed from Google Patents.
US4446185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction injection molded article with threads and method of molding same
Assignee: Hitachi Ltd
•
Filing: 1982-03-08
•
Granted: 1984-05-01
•
Expires: 2002-03-08
Abstract
Abstract A reaction injection molded article formed with threads and a method of molding same, wherein threaded members, such as threaded inserts, helicoils, etc., are positioned in the cavity of a reaction injection mold, and molding material is injected into the cavity to form the threaded members into a unitary structure with a body of the reaction injection molded article. The threaded members are securedly held in place by a surface layer of relatively high density. The molding material is a mixture of an A liquid and a B liquid, the A liquid containing 100 weight parts of polyether polyol obtained by adding alkylene oxide to various kinds of alcohol or amine, 1-5 weight parts of a reaction promoting agent (catalyst) comprising tertiary amines, tin compounds, etc., 3-50 weight parts of water and a foaming agent, such as low boiling point alkylhalide, 1-5 weight parts of a foaming regulating agent, such as alkylene oxide denatured polydimethyl siloxane and 1-20 weight parts, if necessary, of pigment, dyestuff and filler, such as carbon black, diazo compound, silica, glass fiber, etc., and the B liquid containing 100-200 weight parts of MDI, TDI, crude MDI or crude TDI.
Inventors
- 👤 Kenichi Waragai
- 👤 Masao Gotoh
- 👤 Hitoshi Yokono
- 👤 Kazumi Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/34; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/1271; B29C70/00; B29C70/68; B29C33/00; B29C33/12; B29C33/14; B29C44/14; B29C67/00; B29C67/24; B29C67/246; B29K; B29K2105/00; B29K2105/04; B29L; B29L2023/00; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S411/00; Y10S411/904; Y10S411/907; Y10S411/908; Y10T; Y10T428/00; Y10T428/22; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24521; Y10T428/24529; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/249989
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A reaction injection molded article of a foamed polyurethane resin material, formed by mixing and foaming an A liquid and B liquid, the A liquid comprising a polyol, a catalyst and a foaming agent, the B liquid comprising polyisocyanate, comprising: a molded article of said foamed polyurethane resin material, having a surface layer of density of 0.5-1.1 g/cm 3 , said surface layer being a skin layer of the polyurethane resin material, with substantially no foaming action having taken place in said skin layer, said molded article body having holes enclosed by said surface layer; and female threaded members each inserted in one of said holes, said members being held in place rigidly by said surface layer.
Claim 2
Dependent Claim
117 words
A reaction injection molded article of a foamed polyurethane resin material, formed by mixing and foaming an A liquid and B liquid, the A liquid comprising a polyol, a catalyst and a foaming agent, the B liquid comprising polyisocyanate, comprising: a molded article of said foamed polyurethane resin material, having a surface layer of density of 0.5-1.1 g/cm 3 , said surface layer being a skin layer of the polyurethane resin material, with substantially no foaming action having taken place in said skin layer, said molded article body having holes enclosed by said surface layer; and female threaded members each inserted in one of said holes, said members being held in place rigidly by said surface layer.
Claim 3
Dependent Claim
22 words
A reaction injection molded article as claimed in claim 1, wherein said members are made of metal or plastics of high toughness.
Claim 4
Dependent Claim
32 words
A reaction injection molded article as claimed in claim 2, wherein said members are cylindrical in shape and formed with the female threads on the inside and have irregularities on the outside.
Claim 5
Dependent Claim
17 words
A reaction injection molded article as claimed in claim 3, wherein said irregularities are threads or knurlings.
Claim 6
Dependent Claim
32 words
A reaction injection molded article as claimed in claim 2, wherein said members are polygonal in shape and formed with the female threads on the inside and lateral grooves on the outside.
Claim 7
Dependent Claim
15 words
A reaction injection molded article as claimed in claim 1, wherein said members are helicoils.
Claim 8
Dependent Claim
28 words
A reaction injection molded article as claimed in claim 1, wherein the density of the molded article body other than the surface layer is 0.05-0.2 g/cm 3 .
Claim 9
Dependent Claim
32 words
A reaction injection molded article as claimed in claim 1, wherein the members have irregularities on the outside surface thereof enabling said members to be held in place by the surface layer.
Claim 10
Dependent Claim
26 words
A reaction injection molded article as claimed in claim 8, wherein the surface layer has a higher density than the remainder of said molded article body.
Claim 11
Dependent Claim
26 words
A reaction injection molded article as claimed in claim 1, wherein the surface layer has a higher density than the remainder of said molded article body.
Claim 12
Dependent Claim
144 words
A reaction injection molded article of a foamed polyurethane resin material, formed by mixing and forming an A liquid and a B liquid, the A liquid containing 100 weight parts of polyether polyol, 1-5 weight parts of a catalyst, 8-30 weight parts of a low boiling point foaming agent, and the B liquid containing 100-200 weight parts of MDI, TDI, crude MDI or crude TDI, comprising: a molded article body of said foamed polyurethane resin material, having a surface layer of density of 0.5-1.1 g/cm 3 , said surface layer being a skin layer of the polyurethane resin material, with substantially no foaming action having taken place in said skin layer, said molded article body having holes enclosed by said surface layer; and female threaded members each inserted in one of said holes, said members being held in place rigidly by said surface layer.
Claim 13
Dependent Claim
144 words
A reaction injection molded article of a foamed polyurethane resin material, formed by mixing and forming an A liquid and a B liquid, the A liquid containing 100 weight parts of polyether polyol, 1-5 weight parts of a catalyst, 8-30 weight parts of a low boiling point foaming agent, and the B liquid containing 100-200 weight parts of MDI, TDI, crude MDI or crude TDI, comprising: a molded article body of said foamed polyurethane resin material, having a surface layer of density of 0.5-1.1 g/cm 3 , said surface layer being a skin layer of the polyurethane resin material, with substantially no foaming action having taken place in said skin layer, said molded article body having holes enclosed by said surface layer; and female threaded members each inserted in one of said holes, said members being held in place rigidly by said surface layer.
Claim 14
Dependent Claim
38 words
A reaction injection molded article as claimed in claim 11, wherein said polyether polyol is obtained by adding alkylene oxide to an alcohol or amine, and said low boiling point foaming agent is a low boiling point alkylhalide.
Claim 15
Dependent Claim
19 words
A reaction injection molded article as claimed in claim 12, wherein said low boiling point foaming agent is trichlorofluoromethane.
Claim 16
Dependent Claim
35 words
A reaction injection molded article as claimed in claim 12, wherein said polyether polyol is obtained by adding propylene oxide to 4,4'-diaminodiphenylmethane, propylene oxide and ethylene oxide to glycerine, and propylene oxide to monoethanol amine.
Claim 17
Dependent Claim
17 words
A reaction injection molded article as claimed in claim 14, wherein said B liquid is crude MDI.
References Cited (Backward Citations)
US4283898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |