Title of Invention

PRIMER FOR ADHESION ENHANCEMENT OF ACRYLIC FOAM TAPE AND PROCESS OF PREPARING THE SAME

Abstract A process of preparing "Primer For Adhesion Enhancement Of Acrylic Foam Tape" comprises of: (i) Taking 12.5 to 25 parts of aromatic solvent ^TolueneJ in a '^ kettle/container and adding 25 to 50 parts of halogenated polyolefm resin followed by stirring to get homogeneous solution. (ii) 12.5 to 25 parts diisocyanate Cross linker is then added to the solution in step (i) and allowed to react at room temperature to develop cross-linking sites and thereafter the content is packed in air tight containers having oxygen scavengers and moisture free inert gas
Full Text FORM 2



THE PATENTS ACT, 1970
(39 of 1970)
COMPLETE SPECIFICATION
(See Section 10) ^ff^^'y^^

"PRIMER FOR ADHESION ENHANCEMENT OF ACRYLIC FOAM TAPE" AND PROCESS OF IVfea^^gACTURING THE SAME.

PRS Solutions Private Limited, a Company incorporated under the Companies Act, 1956 and having its office at 63, Bombay Samachar Marg, Mumbai-400 001, Maharashtra State, India, pidi*. Indfa'n.

The following specification particularly describes a
invention and the manner in which it is to be performed

the nature of this





FIELD OF THE INVENTION:
The present invention relates to "Primer For Adhesion Enhancement Of Acrylic Foam Tape" and process of preparing the same. The said primer is a novel liquid primer used for enhancing adhesion of an acrylic foam tape for bonding to a plastic material.
DESCRIPTION OF THE PRIOR ART:
Acrylic Foam Tape is a high performance tape used for all types of body side moldings, stainless steel rocket panel trim, cladding, grounds effects, wind and bug deflectors, interior dash trim kits and most other automotive accessories and trim parts. Acrylic foam tape is used globally for both Original Equipment Manufacturer and after-market trim attachment.
A low surface energy plastic has a hard-to-stick-to surface, similar to Teflon coating. Adhesion is the force of attraction between two substrates. The strength of this attraction is determined in part by the surface energy. The higher the surface energy, the greater the attraction; the lower the surface energy the weaker the attractive forces. A high surface energy plastic allows the adhesive to wet-out or flows to obtain a stronger bond. Low surface energy plastic needs an adhesive specially designed to bond to it or an adhesion promoter to alter the surface energy.
An adhesion promoter or primer is most commonly a resin system in a solvent carrier that is used to alter the surface characteristics of a substrate. This alteration will enhance or in some instances create a surface for bonding with a particular pressure sensitive adhesive. Adhesion promoters are most often used on low surface energy materials such as Thermoplastic Polyolefin, polypropylene, Polyphylene Oxide, polycarbonate and many other plastics and plastic alloys.

INVENTION:
The presently developed primer consisting of resin & crosslinker creates a good bond between the low surface energy plastic materials and acrylic foam tape.
1. This invention relates to the preparing of "Primer For Adhesion Enhancement Of Acrylic Foam Tape". The preparing starts by: (i) Taking 12,5 to 25 parts of aromatic solvent (like Toluene) in a kettle/container having suitable stirring device and adding 25 to 50 parts of halogenated polyolefin ( resin) followed by stirring to get homogeneous solution. (ii) 12.5 to 25 parts diisocyanate (Cross linker ) is then added to the solution in step (i) and stirred. The solid content is in the range of 10-15% w/w, controlled by the addition of aromatic solvent as required.
The admixture (primer) so obtained is allowed to react at room temperature to develop cross-linking sites and is then packed in air tight containers containing oxygen scavengers to the extent of 1 to 10 parts of the final volume of the pack size previously flushed with moisture free inert gas like nitrogen. The filled containers are again provided with moisture free inert gas nitrogen blanketing on the head space to achieve desired shelf life of the contents.
The primer can be applied with a pressurised flow gun, knurled roller, brush, or other similar type applicator on the plastic substrate. The solvent should be allowed to evaporate and the acrylic foam tape should be applied within 5-10 minutes. Drying time varies with thickness of primer applied, temperature and humidity. The complete bond formation between plastic substrate and acrylic foam tape takes place within 48 hours from the time of Application of the tape, due to the cross linking sites getting further activated on accoimt of moisture present in the environment.

WE CLAIM:
1. A process of preparing "Primer For Adhesion Enhancement Of Acrylic Foam Tape"
comprises of:
(i) Taking 12.5 to 25 parts of aromatic solvent ^TolueneJ in a '^ kettle/container and adding 25 to 50 parts of halogenated polyolefm resin followed by stirring to get homogeneous solution.
(ii) 12.5 to 25 parts diisocyanate Cross linker is then added to the solution in step (i) and allowed to react at room temperature to develop cross-linking sites and thereafter the content is packed in air tight containers having oxygen scavengers and moisture free inert gas.
2. A process of preparing "Primer For Adhesion Enhancement Of Acrylic Tape" wherein
the inert gas is a nitrogen.

(Bharat S. Shah) Duly Constituted Attorney
Dated this 21' day of March, 2002

Documents:

277-mum-2002-cancelled pages(29-11-2004).pdf

277-mum-2002-claims(granted)-(23-03-2002).doc

277-mum-2002-claims(granted)-(29-11-2004).pdf

277-mum-2002-correspondence(30-12-2004).pdf

277-mum-2002-correspondence(ipo)-(17-11-2004).pdf

277-mum-2002-form 1(22-03-2002).pdf

277-mum-2002-form 19(17-07-2003).pdf

277-mum-2002-form 2(granted)-(29-11-2004).doc

277-mum-2002-form 2(granted)-(29-11-2004).pdf

277-mum-2002-form 26(23-03-2002).pdf

277-mum-2002-form 3(22-03-2002).pdf

277-mum-2002-form 5(22-03-2002).pdf


Patent Number 205597
Indian Patent Application Number 277/MUM/2002
PG Journal Number 26/2007
Publication Date 29-Jun-2007
Grant Date 05-Apr-2007
Date of Filing 22-Mar-2002
Name of Patentee PRS SOLUTIONS PRIVATE LIMITED
Applicant Address 63, BOMBAY SAMACHAR MARG, MUMBAI-400001,
Inventors:
# Inventor's Name Inventor's Address
1 SHROFF PRADIP HIRALAL 1820,WALLACE APARTMENTS,SLATER ROAD, MUMBAI-400007,
PCT International Classification Number C 09 D 4/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA