EP0282243A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Abrasive filaments and production process thereof
Assignee: Kureha Corp
•
Filing: 1988-03-04
•
Granted: —
•
Expires: 2008-03-04
Abstract
Abstract Abrasive filaments made of a composition which comprises 95 - 70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity ( eta inh) ranges from 0.9 to 1.4, and 5 - 30 vol.% of abrasive grains. They are produced by melt-spinning the composition and then stretching the resultant filaments at a draw ratio of 2.5 times - 5.5 times within a temperature range of 100 - 200 DEG C.
Inventors
- 👤 Tomoo Susa
- 👤 Seiichi Ohira
- 👤 Hiroyuki Endo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 20:24
CPC Classifications
C; C08; C08J; C08J5/00; D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; D01F1/00; D01F1/02; D01F1/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
45 words
Abrasive filaments made of a composition comprising resin and abrasive grains characterised in that the composition comprises 95 - 70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity (η inh ) ranges from 0.9 to 1.4, and 5 - 30 vol.% of abrasive grains.
Claim 2
Dependent Claim
45 words
Abrasive filaments made of a composition comprising resin and abrasive grains characterised in that the composition comprises 95 - 70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity (η inh ) ranges from 0.9 to 1.4, and 5 - 30 vol.% of abrasive grains.
Claim 3
Dependent Claim
31 words
The abrasive filaments as claimed in Claim 1, wherein the polyvinylidene fluoride resin is a high melting-point polyvinylidene fluoride resin whose melting point (T m1 ) ranges from 165°C to 185°C.
Claim 4
Dependent Claim
77 words
The abrasive filaments as claimed in Claim 1, wherein the polyvinylidene fluoride resin is a polymer blend composed of a high melting-point polyvinylidene fluoride resin whose melting point (T m1 ) ranges from 165°C to 185°C and a low melting-point polyvinylidene fluoride resin whose melting point (T m2 ) ranges from 125°C to 170°C, and the melting points (T m1 ),(T m2 ) satisfy the following equation: 50°C ≧ (T m1 - T m2 ) ≧ 5°C.
Claim 5
Dependent Claim
51 words
The abrasive filaments as claimed in Claim 3, wherein the polymer blend is composed of less than 100 wt.% but not less than 20 wt.% of the high melting- point polyvinylidene fluoride resin and greater than 0 wt.% but not greater than 80 wt.% of the low melting-point polyvinylidene fluoride resin.
Claim 6
Dependent Claim
40 words
The abrasive filaments as claimed in Claim 3, wherein the polymer blend is composed of 99 wt.% - 50 wt.% of the high melting-point polyvinylidene fluoride resin and 1 wt.% - 50 wt.% of the low melting-point polyvinylidene fluoride resin.
Claim 7
Dependent Claim
40 words
The abrasive filaments as claimed in Claim 3, wherein the polymer blend is composed of 80 wt.% - 55 wt.% of the high melting-point polyvinylidene fluoride resin and 20 wt.% - 50 wt.% of the low melting-point polyvinylidene fluoride resin.
Claim 8
Dependent Claim
31 words
The abrasive filaments as claimed in Claim 3, wherein the melting points (T m1 ),(T m2 ) satisfy the following equation: 40°C ≧ (T m1 - T m2 ) ≧ 10°C.
Claim 9
Dependent Claim
32 words
The abrasive filaments as claimed in Claim 1, wherein the composition comprises 90 vol.% - 80 vol.% of the polyvinylidene fluoride resin and 10 vol.% - 20 vol.% of the abrasive grains.
Claim 10
Dependent Claim
25 words
The abrasive filaments as claimed in claim 1, wherein the inherent viscosity (η inh ) of the polyvinylidene fluoride resin ranges from 1.0 to 1.3.
Claim 11
Dependent Claim
19 words
The abrasive filaments as claimed in claim 1, wherein the filaments has a diameter of 0.1 - 3 mm.
Claim 12
Dependent Claim
28 words
The abrasive filaments as claimed in claim 1, wherein the filaments have been stretched at a draw ratio of 2.5 - 5.5. times subsequent to their melt spinning.
Claim 13
Dependent Claim
78 words
A process for the production of abrasive filaments by melt-spinning a blend of resin and abrasive grains characterised in that the process comprises: melt-spinning a composition of 95 - 70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity (η inh ) ranges from 0.9 to 1.4, and 5 - 30 vol.% of abrasive grains; and stretching the resultant filaments at a draw ratio of 2.5 times - 5.5 times within a temperature range of 100 - 200°C.
Claim 14
Dependent Claim
78 words
A process for the production of abrasive filaments by melt-spinning a blend of resin and abrasive grains characterised in that the process comprises: melt-spinning a composition of 95 - 70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity (η inh ) ranges from 0.9 to 1.4, and 5 - 30 vol.% of abrasive grains; and stretching the resultant filaments at a draw ratio of 2.5 times - 5.5 times within a temperature range of 100 - 200°C.
Claim 15
Dependent Claim
21 words
The process as claimed in claim 12, wherein the filaments are filaments as defined in any of claims 2 to 10.
Claim 16
Dependent Claim
24 words
A process as claimed in claim 12 or claim 13, further comprising thermally fixing the thus-stretched filaments at a temperature of at least 60°C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.