IE41762L - Water vapour permeable sheet material - Google Patents
Water vapour permeable sheet materialInfo
- Publication number
- IE41762L IE41762L IE741575A IE157574A IE41762L IE 41762 L IE41762 L IE 41762L IE 741575 A IE741575 A IE 741575A IE 157574 A IE157574 A IE 157574A IE 41762 L IE41762 L IE 41762L
- Authority
- IE
- Ireland
- Prior art keywords
- layer
- thick
- voids
- polyurethane
- pores
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
- C08J2201/054—Precipitating the polymer by adding a non-solvent or a different solvent
- C08J2201/0542—Precipitating the polymer by adding a non-solvent or a different solvent from an organic solvent-based polymer composition
- C08J2201/0544—Precipitating the polymer by adding a non-solvent or a different solvent from an organic solvent-based polymer composition the non-solvent being aqueous
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
1483453 Porous composite elastomer sheet PORVAIR Ltd 25 July 1974 [25 July 1973] 35469/73 Heading B2E [Also in Division C3] A water-vapour-permeable soft flexible sheet #0.8 mm thick, has #3 superimposed porous layers of elastomeric polymer; is free from fibrous reinforcement and has elongation at break >200%; and comprises, in order, a flesh-coat layer (a), a strength-imparting substrate layer (b), and a topcoat layer (c), (b) having greater density than (a) and (c), the combined thickness of (a) and (c) being 30- 175% of the thickness of (b). (a) and (c) may adhere integrally to (b). The sheet may be made by: successively depositing coagulable elastomeric polymer composition layers (A), (B) and (C) respectively, containing removable particulate filler (F A ), (F B ), and (F C ) respectively; layer (A) being deposited on a porous support to form (a), then, prior to coagulation of (A), layer (B) is deposited on (A), and then, prior to coagulation of (A) and (B), layer (C) is deposited; the composite material is then coagulated. (F A ) and (F' C ) have mean particle size smaller than (F B ). The coagulation may be performed by contact with a non-solvent, e.g. water, and the fillers may be leached out. The filler may be NaCl or other inorganic salt. The non-solvent may comprise 0-30% solvent and 0-15% of the filler substance. Composition (B) may comprise a 25-40% wt solution of a polyurethane in a polar organic solvent (S B ) with filler (F B ) dispersed therethrough, (F B ) being insoluble in (S B ), (F B ) having average particle size 20-200 Ám, where (F B )/(F B ) polyurethane polyurethane weight ratio is from 1.8 to 2.7; and where (F A ) and (F B ) have average particles size <20 Ám. Each layer (a), (b) and (c) may be microporous, having randomlydistributed compact voids intercommunicating via pores penetrating the walls between the voids, the thickness of these walls being greater in (b) than in (a) or (c). Layer (b) may be 0.5-1.5 mm thick, have a total void volume or porosity 50-65% where #50% of the porosity is due to interconnecting pores and voids, the pores having diameter 5-100 Ám; non-interconnecting pores may have diameter 1-30 Ám, being 1-10 Ám apart, and may occur in regions the majority of which are 30-100 Ám thick between adjacent voids. Layers (a) and (c) may have voids 5-75 Ám wide, separated by walls 1-5 Ám thick having pores passing through. The polymer may be: in (b), a polyester-polyurethane, and in (a) and (c), a polyester-urethane or polyether-urethane having lower Shore hardness than that of (b): or the same polyurethane may be used for all 3 layers. The cut tear strength may be #1.5 kg, and (cut-tear strength)/stiffness may be >4.2. Topcoat (c) may be finished to form a thin densified permeable layer, #30 Ám thick, at the outer surface of (c).
[GB1483453A]
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB35469/73A GB1483453A (en) | 1973-07-25 | 1973-07-25 | Water vapour permeable sheet materials |
Publications (2)
Publication Number | Publication Date |
---|---|
IE41762L true IE41762L (en) | 1975-01-25 |
IE41762B1 IE41762B1 (en) | 1980-03-26 |
Family
ID=10378072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE1575/74A IE41762B1 (en) | 1973-07-25 | 1974-07-24 | Water vapour permeable sheet materials |
Country Status (17)
Country | Link |
---|---|
JP (1) | JPS5058586A (en) |
AR (1) | AR201157A1 (en) |
AU (1) | AU7157374A (en) |
BE (1) | BE818060A (en) |
BR (1) | BR7406112D0 (en) |
CA (1) | CA1052196A (en) |
DD (1) | DD119550A5 (en) |
DE (1) | DE2435880A1 (en) |
DK (1) | DK399874A (en) |
FR (1) | FR2238586B3 (en) |
GB (1) | GB1483453A (en) |
IE (1) | IE41762B1 (en) |
LU (1) | LU70599A1 (en) |
NL (1) | NL7410067A (en) |
PL (1) | PL100435B1 (en) |
SU (1) | SU722495A3 (en) |
ZA (1) | ZA744732B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6047954B2 (en) * | 1978-12-06 | 1985-10-24 | 東レ株式会社 | Coating fabric and its manufacturing method |
-
1973
- 1973-07-25 GB GB35469/73A patent/GB1483453A/en not_active Expired
-
1974
- 1974-07-24 JP JP49085023A patent/JPS5058586A/ja active Pending
- 1974-07-24 DK DK399874A patent/DK399874A/da unknown
- 1974-07-24 BE BE146918A patent/BE818060A/en unknown
- 1974-07-24 ZA ZA00744732A patent/ZA744732B/en unknown
- 1974-07-24 IE IE1575/74A patent/IE41762B1/en unknown
- 1974-07-24 AU AU71573/74A patent/AU7157374A/en not_active Expired
- 1974-07-24 LU LU70599*A patent/LU70599A1/xx unknown
- 1974-07-24 BR BR6112/74A patent/BR7406112D0/en unknown
- 1974-07-24 AR AR254878A patent/AR201157A1/en active
- 1974-07-25 DD DD180130A patent/DD119550A5/xx unknown
- 1974-07-25 SU SU742052252A patent/SU722495A3/en active
- 1974-07-25 PL PL1974172998A patent/PL100435B1/en unknown
- 1974-07-25 FR FR7425860A patent/FR2238586B3/fr not_active Expired
- 1974-07-25 CA CA205,572A patent/CA1052196A/en not_active Expired
- 1974-07-25 NL NL7410067A patent/NL7410067A/en unknown
- 1974-07-25 DE DE2435880A patent/DE2435880A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
FR2238586B3 (en) | 1978-03-17 |
LU70599A1 (en) | 1976-05-31 |
AR201157A1 (en) | 1975-02-14 |
BR7406112D0 (en) | 1975-05-13 |
DD119550A5 (en) | 1976-05-05 |
PL100435B1 (en) | 1978-10-31 |
IE41762B1 (en) | 1980-03-26 |
CA1052196A (en) | 1979-04-10 |
SU722495A3 (en) | 1980-03-15 |
DE2435880A1 (en) | 1975-02-06 |
NL7410067A (en) | 1975-01-28 |
FR2238586A1 (en) | 1975-02-21 |
GB1483453A (en) | 1977-08-17 |
AU7157374A (en) | 1976-01-29 |
BE818060A (en) | 1975-01-24 |
JPS5058586A (en) | 1975-05-21 |
ZA744732B (en) | 1976-02-25 |
DK399874A (en) | 1975-03-03 |
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