Canadian Patents Database / Patent 2350112 Summary

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(12) Patent: (11) CA 2350112
(54) English Title: PROCESS TO IMPROVE THERMAL PROPERTIES OF NATURAL FIBRE COMPOSITES
(54) French Title: METHODE DE TRAITEMENT PERMETTANT D'AMELIORER LES PROPRIETES THERMIQUES DE COMPOSITES DE FIBRES NATURELLES
(51) International Patent Classification (IPC):
  • C08L 23/06 (2006.01)
  • C08L 1/02 (2006.01)
  • C08L 23/02 (2006.01)
  • C08L 23/10 (2006.01)
  • C08L 23/12 (2006.01)
  • C08L 23/16 (2006.01)
  • C08L 97/02 (2006.01)
(72) Inventors (Country):
  • SAIN, MOHINI (Canada)
(73) Owners (Country):
  • SAIN, MOHINI (Canada)
(71) Applicants (Country):
  • SAIN, MOHINI (Canada)
(74) Agent: NA
(45) Issued: 2004-06-29
(22) Filed Date: 2001-06-12
(41) Open to Public Inspection: 2002-12-12
Examination requested: 2001-06-12
(30) Availability of licence: N/A
(30) Language of filing: English

English Abstract

Lignocellulosic and cellulosic fibres are melt processed with polyolefin plastic and an imide monomer first in a high shear thermo-kinetic mixer and then in a plastic extruder or injection molder to produce reinforced plastic composite products.


French Abstract

Les fibres lignocellulosiques et cellulosiques sont d'abord transformées par fusion avec un plastique polyoléfinique et un monomère d'imide dans un mélangeur thermocinétique, puis dans une extrudeuse à plastique ou moule à injection pour produire des produits de composite plastique renforcés.


Note: Claims are shown in the official language in which they were submitted.


The embodiments of the invention in which an exclusive property or privilege
is claimed
are defined as follows:

1. A natural fiber-reinforced polyolefin resin composite prepared by first
melt-mixing
and then injection molding or extruding a mixture comprised of:
(a) 50 to 80 parts by weight of a polyolefin selected from polyethylene,
polypropylene
and a mixture of polypropylene and ethylene-propylene copolymer,
(b) 20 to 50 parts by weight of natural fiber selected from wood flour, thermo
mechanical
pulp, bleached kraft, flax and recycled newsprint,

28a


(c) an imide additive in an amount 0.05 to 5 parts by weight per 100 parts by
weight of
the sum of components (a) and (b),
(d) said composite may contain an activator or a combination of activators
selected
from thiazole, thiuram and dithiocarbamate compounds in which said activator
to
said imide additive ratio falls within the range of 0.01 to 0.3 said composite
having
a heat distortion temperature above 90° centigrade at 1.8 MPa load and
a relative
creep of less than 200% at 30% load of the respective flexural strength of
composites
at 40° centigrade.

2. The natural fiber-reinforced composite of claim 1, wherein the imide is N,
N' 1, 3 -
phenylenedimaleimide.

3. The natural fiber-reinforced composite of claim 1 wherein the wood flour
having
particle size of 20 to 100 mesh.

4. The natural fiber-reinforced composite of claim 1 wherein the wood fiber,
recycled
newsprint and flax fiber having aspect ratio of 10 to 250.

5. The natural fiber-reinforced composite of claim 1 wherein the composite
does not
contain any activator.

6. The natural fiber-reinforced composite of claim 1 wherein the composite is
melt-
mixed and processed not below 200° centigrade without any activator
compound.

7. The natural fiber-reinforced composite of claim 1 wherein the composite
does
contain an activator or a combination of activators.

8. The natural fiber-reinforced composite of claim 1 wherein the activators
are selected
from dibenzthiazyl disulfide; 2-mercaptobenzthiazole, Tetramethyl thiuram
disulfide;
and cyclohexyl benzthiazyl sulphenamide.

29



9. The natural fiber-reinforced composite of claim 1 wherein the activator is
dibenzthiazyl disulfide.

10. The natural fiber-reinforced composite of claim 8 wherein the composite is
melt-
mixed and processed at a temperature of from 180° centigrade to
230° centigrade.

11. The natural fiber-reinforced composite of claim 1 wherein the imide
compound is
Image
represented by the chemical structure Formula I wherein R1, is selected from
hydrogen, alkyl, aryl, cyclohexyl, N-substituted imide and imide ester; R2 and
R3 are
selected from H, alkyl and aryl group.

12. The natural fiber-reinforced composite of claim 1, wherein imide compound
is
selected from maleimidopropionate; hydroxysuccinimide ester derivative;
dimaleimide; and hydroxysuccinimide derivative.

13. A premixed composite in the form of granulates obtained by granulating a
natural
fiber-reinforced polyolefin composition obtained by melt-mixing a mixture
consists of
(a) 50 to 80 parts by weight of a polyolefin selected from polyethylene,
polypropylene
and a mixture of polypropylene and ethylene-propylene copolymer, (b) 20 to 50
parts
by weight of natural fiber selected from wood flour, thermo mechanical pulp,
bleached kraft, flax and recycled newsprint, (c) an imide compound in an
amount 0.05
to 5 parts by weight per 100 parts by weight of the sum of components (a) and
(b),




with or without an activator or a combination of activators selected from
thiazole,
thiuram and dithiocarbamate compounds in which said activator to said imide
additive ratio falls within the range of 0.01 to 0.3 said composite having a
heat
distortion temperature above 90° centigrade at 1.8 MPa load and a
relative creep of
less than 200% at 30% load of the respective flexural strength of composites
at 40°
centigrade.

31



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Admin Status

Title Date
(22) Filed 2001-06-12
Examination Requested 2001-06-12
(41) Open to Public Inspection 2002-12-12
(45) Issued 2004-06-29

Maintenance Fee

Description Date Amount
Last Payment 2017-06-09 $225.00
Next Payment if small entity fee 2018-06-12 $225.00
Next Payment if standard fee 2018-06-12 $450.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

  • the reinstatement fee set out in Item 7 of Schedule II of the Patent Rules;
  • the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
  • the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $200.00 2001-06-12
Filing $150.00 2001-06-12
Maintenance Fee - Application - New Act 2 2003-06-12 $50.00 2002-09-11
Maintenance Fee - Application - New Act 3 2004-06-14 $50.00 2002-09-11
Final $150.00 2004-04-15
Maintenance Fee - Patent - New Act 4 2005-06-13 $50.00 2005-04-11
Maintenance Fee - Patent - New Act 5 2006-06-12 $100.00 2006-04-10
Maintenance Fee - Patent - New Act 6 2007-06-12 $100.00 2007-04-16
Back Payment of Fees $100.00 2008-04-11
Maintenance Fee - Patent - New Act 7 2008-06-12 $300.00 2008-09-05
Maintenance Fee - Patent - New Act 8 2009-06-12 $100.00 2009-03-26
Maintenance Fee - Patent - New Act 9 2010-06-14 $100.00 2010-03-29
Maintenance Fee - Patent - New Act 10 2011-06-13 $125.00 2011-03-29
Maintenance Fee - Patent - New Act 11 2012-06-12 $125.00 2012-03-29
Maintenance Fee - Patent - New Act 12 2013-06-12 $125.00 2013-04-12
Maintenance Fee - Patent - New Act 13 2014-06-12 $125.00 2014-04-03
Maintenance Fee - Patent - New Act 14 2015-06-12 $125.00 2015-06-12
Maintenance Fee - Patent - New Act 15 2016-06-13 $225.00 2016-05-09
Maintenance Fee - Patent - New Act 16 2017-06-12 $225.00 2017-06-09

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Abstract 2003-06-09 1 10
Claims 2003-06-09 4 128
Description 2003-06-09 29 1,292
Abstract 2001-06-12 1 10
Description 2001-06-12 29 995
Claims 2001-06-12 4 119
Cover Page 2002-11-29 1 22
Abstract 2003-12-12 1 13
Claims 2003-12-12 4 99
Description 2003-12-12 28 992
Abstract 2004-02-26 1 9
Description 2004-02-26 28 933
Claims 2004-02-26 4 92
Cover Page 2004-06-01 1 23
Fees 2005-04-11 3 130
Fees 2011-03-29 1 62
Fees 2006-04-10 1 101
Correspondence 2001-07-10 1 10
Correspondence 2002-05-23 1 22
Correspondence 2002-07-22 1 14
Correspondence 2002-09-19 1 18
Prosecution-Amendment 2003-01-30 3 80
Prosecution-Amendment 2003-06-09 37 1,568
Prosecution-Amendment 2003-08-22 2 68
Prosecution-Amendment 2003-12-12 35 1,135
Fees 2002-09-11 3 81
Prosecution-Amendment 2004-02-12 1 27
Prosecution-Amendment 2004-02-26 34 1,052
Correspondence 2004-04-15 1 86
Fees 2007-04-16 1 61
Correspondence 2008-05-01 1 30
Fees 2008-04-11 1 71
Correspondence 2008-05-21 1 24
Fees 2008-09-05 1 88
Fees 2009-03-26 1 63
Fees 2010-03-29 1 62
Fees 2012-03-29 1 68
Fees 2013-04-12 1 71
Fees 2014-04-03 1 68
Fees 2015-06-12 1 68
Correspondence 2015-06-12 1 29
Fees 2016-05-09 1 70
Fees 2017-06-09 1 64