EP0247708A2
Expired / Lapsed
EP
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Method for manufacturing rim composites
Assignee: Ex-Cell-O Corp
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Filing: 1987-03-18
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Granted: —
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Expires: 2007-03-18
Abstract
Abstract A polyurethane RIM method has two mixheads. Reactants are brought to each mixhead and are supplied as separate streams to two spaced cavities in a mold having a pre-formed porous mat separating the two cavities. One stream contains an isocyanate, polyol, chain extender and crosslinker selected to have a very low viscosity and which reacts to produce a high modulus armature or load bearing member. The other stream contains a polyol and isocyanate with additives that have relatively high viscosity to produce a semi-rigid polyurethane foam. At each mixhead the proportions of ingredients are controlled to give a desired isocyanate index to control the flex modulus and other properties of the loading bearing member and foam molded components of the product. The low viscosity material penetrates the porous mat to reinforce it and the porosity of the mat prevents the high viscosity material from entering the armature cavity so as to reduce the load capacity of the finished product.
Inventors
- 👤 Frank J. Preston
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 15:32
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/0461; B29C44/0469; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B7/7433; B29B7/7471; B29C44/12; B29C44/1209; B29C67/00; B29C67/24; B29C67/246; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; B29C70/28; B29C70/30; B29C70/36; B29C70/54; B29C70/541; B29C44/14; B29K; B29K2075/00; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/08; B29K2105/0854; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/237
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
A method of manufacturing a composite RIM article which comprises the steps of providing a RIM mold with a female body having a cavity therein; providing a divider having a preselected porosity; locating the divider in the cavity to divide it into lower and upper air-filled spaces; pre-mixing a low viscosity RIM mixture and a high viscosity RIM mixture; simultaneously injecting the respective mixtures as separate streams into one or the other of the lower and upper air-filled spaces in an amount to fill such spaces and at a rate that prevents the high viscosity material from passing into the pores of the divider and which permits the low viscosity material to penetrate the pores of the divider without significant amounts of the low viscosity material mixing with the high viscosity material; and allowing the RIM materials to react and set within the mold to form a composite RIM article in a one-step process.
Claim 2
Independent Claim
154 words
A method of manufacturing a composite RIM article which comprises the steps of providing a RIM mold with a female body having a cavity therein; providing a divider having a preselected porosity; locating the divider in the cavity to divide it into lower and upper air-filled spaces; pre-mixing a low viscosity RIM mixture and a high viscosity RIM mixture; simultaneously injecting the respective mixtures as separate streams into one or the other of the lower and upper air-filled spaces in an amount to fill such spaces and at a rate that prevents the high viscosity material from passing into the pores of the divider and which permits the low viscosity material to penetrate the pores of the divider without significant amounts of the low viscosity material mixing with the high viscosity material; and allowing the RIM materials to react and set within the mold to form a composite RIM article in a one-step process.
Claim 3
Dependent Claim
35 words
In the method of claim 1, selecting said low viscosity RIM material to have an isocyanate index in the range of 100 to 120 to produce a load carrying member in the composite RIM article.
Claim 4
Dependent Claim
32 words
In the method of claim 1, selecting said high viscosity RIM material to have an isocyanate index of 80 to 105 to produce a semi-rigid foam layer in the composite RIM article.
Claim 5
Independent Claim
163 words
A method of manufacturing a composite RIM article which comprises the steps of providing a RIM mold with a female body having a cavity therein; providing a divider having a preselected porosity; pre-loading the female body with a preformed vinyl skin; locating the divider in the cavity to divide it into lower and upper air-filled spaces; pre-mixing a low viscosity RIM mixture and a high viscosity RIM mixture; simultaneously injecting the respective mixtures as separate streams into one or the other of the lower and upper air-filled spaces in an amount to fill such spaces and at a rate that prevents the high viscosity material from passing into the pores of the divider and which permits the low viscosity material to penetrate the pores of the divider without significant amounts of the low viscosity material mixing with the high viscosity material; and allowing the RIM materials to react and set within the mold to form a composite RIM article in a one-step process.
Claim 6
Independent Claim
163 words
A method of manufacturing a composite RIM article which comprises the steps of providing a RIM mold with a female body having a cavity therein; providing a divider having a preselected porosity; pre-loading the female body with a preformed vinyl skin; locating the divider in the cavity to divide it into lower and upper air-filled spaces; pre-mixing a low viscosity RIM mixture and a high viscosity RIM mixture; simultaneously injecting the respective mixtures as separate streams into one or the other of the lower and upper air-filled spaces in an amount to fill such spaces and at a rate that prevents the high viscosity material from passing into the pores of the divider and which permits the low viscosity material to penetrate the pores of the divider without significant amounts of the low viscosity material mixing with the high viscosity material; and allowing the RIM materials to react and set within the mold to form a composite RIM article in a one-step process.
Claim 7
Dependent Claim
35 words
In the method of claim 4, selecting said low viscosity RIM material to have an isocyanate index in the range of 100 to 102 to produce a load carrying member in the composite RIM article.
Claim 8
Dependent Claim
32 words
In the method of claim 5, selecting said high viscosity RIM material to have an isocyanate index of 80 to 105 to produce a semi-rigid foam layer in the composite RIM article.
Claim 9
Dependent Claim
21 words
In the method of claim 1, selecting said low viscosity materials from a chemical group comprised of: polyurea, polyester and polyamide.
Claim 10
Dependent Claim
21 words
In the method of claim 4, selecting said low viscosity materials from a chemical group comprised: of polyurea, polyester and polyamide.
References Cited (Backward Citations)
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