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A Process For The Preparation A Quick Setting Polymer Composition
Abstract: This invention relates to a process for the preparation of a quick setting polymer composition comprising the steps of adding a diisocyanate compound such as herein described to a solution of a first diof compound such as herein described, the ratio of the diisocyanate composition to dio being in the range of 4.2 to 1.1. followed by adding a catalyst solution thereto, such as herein described in the proportion of 0.067 % to 0.2% of the total mass of the reactants to obtain a prepolymer mixture, adding a solution of a second diol to the prepolymer mixture such that the two diols are in a wt % of 10-90 wt% and 90-10 wt% and allowing the reaction to continue for a predetermined period, such as herein described followed by partial evaporation of the solvent to obtain the quick setting polymer composition.
Notices, Deadlines & Correspondence
Patent Information
Applicants
INDIAN INSTITUTE OF TECHNOLOGY
Inventors
1. NIYOGI SOBHANM
2. MANDAL RANJIT
3. SARKAR SANJAY
4. GUPTA TARAKRANJAN
5. DE DEBASISH
6. ADHIKARI BASUDAM
Specification
- 1A -FIELD OF THE INVENTION
This invention relates to a process for the preparation of a quick setting polymer composition.
This invent ion further relates to a quick setting polymer composition, for forming sheets or impregnating fabric, for applications in high strength composites. BACKGROUND OF THE . INVENTION
In high strength composites, curing time and temperature play a
key role. Some applications may require cutting/setting of the
item by moisture at ambient temperature at a faster rate
simultaneously having adequate working/shaping,time. Such appli
cations also, require good shelf stability in af moisture free
sealed packing.. So. for composite applications, a fabric: with
suitable weave pattern requires to be impregnated with the
polymer in a moisture-free condition and,packed immediately under
inert atmosphere. The polyurethanes undergo hardening by moisture
curing in presence of a suitable catalyst- such ,a material
comprises a fabric coated/impregnated with about 40-250% by
weight of resin based on the uncoted fabric having a reasonable
shelf life in moisture-free condition.
OBJECTS OF THE INVENTION
It is therefore an object- of this invention to propose a process for the preparation of a quick setting polymer composition which is strong and has quick setting properties.
-3-
10-20 mins. with constant stirring. At the end, a high viscous polyurethane solution is obtained. Some amount of THF is removed under reduced pressure.
In an embodiment according to this invention, the composition is cast on a substrate such as a glass or a fabric followed by moisture curing to obtain the polyurethane sheet or polyurethane impregnated fabric. Moisture curing of the sheet or the coated fabric is allowed by exposing the sheet on glass plate or the coated fabric to ambient environment upto 24 hrs.. Such sheet or the coated fabric developed adequate strength and dimensional stabi1ity even after 20 mins. exposure to ambient atmospheric humidity.
The diols are selected from ethane dial, butane diol, neopentyl
glycol (NPG), diethsnolamine and polyethylene glycol(PEG). The two diols are
used in the range of 10-9o wt% and 90-10 wt%.
One of the following diisocyanates, viz . TD1 (2,4-toluenediisocyanate), MDI (4,4'-diphenylmethane diisocyanate), HDI (hexa-methylene di isocysnate), IPDI
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 686-CAL-2000-20-01-2023-ALL DOCUMENTS.pdf | 2023-01-20 |
| 1 | 686-CAL-2000-FORM 27.pdf | 2011-10-07 |
| 2 | 00686-cal-2000 letters patent.pdf | 2011-10-07 |
| 2 | 00686-cal-2000 abstract.pdf | 2011-10-07 |
| 3 | 00686-cal-2000 g.p.a.pdf | 2011-10-07 |
| 3 | 00686-cal-2000 claims.pdf | 2011-10-07 |
| 4 | 00686-cal-2000 correspondence.pdf | 2011-10-07 |
| 4 | 00686-cal-2000 form-5.pdf | 2011-10-07 |
| 5 | 00686-cal-2000 form-3.pdf | 2011-10-07 |
| 5 | 00686-cal-2000 description(complete).pdf | 2011-10-07 |
| 6 | 00686-cal-2000 form-2.pdf | 2011-10-07 |
| 6 | 00686-cal-2000 description(provisional).pdf | 2011-10-07 |
| 7 | 00686-cal-2000 form-18.pdf | 2011-10-07 |
| 7 | 00686-cal-2000 form-1.pdf | 2011-10-07 |
| 8 | 00686-cal-2000 form-18.pdf | 2011-10-07 |
| 8 | 00686-cal-2000 form-1.pdf | 2011-10-07 |
| 9 | 00686-cal-2000 form-2.pdf | 2011-10-07 |
| 9 | 00686-cal-2000 description(provisional).pdf | 2011-10-07 |
| 10 | 00686-cal-2000 description(complete).pdf | 2011-10-07 |
| 10 | 00686-cal-2000 form-3.pdf | 2011-10-07 |
| 11 | 00686-cal-2000 correspondence.pdf | 2011-10-07 |
| 11 | 00686-cal-2000 form-5.pdf | 2011-10-07 |
| 12 | 00686-cal-2000 g.p.a.pdf | 2011-10-07 |
| 12 | 00686-cal-2000 claims.pdf | 2011-10-07 |
| 13 | 00686-cal-2000 letters patent.pdf | 2011-10-07 |
| 13 | 00686-cal-2000 abstract.pdf | 2011-10-07 |
| 14 | 686-CAL-2000-FORM 27.pdf | 2011-10-07 |
| 14 | 686-CAL-2000-20-01-2023-ALL DOCUMENTS.pdf | 2023-01-20 |