CN109825205A - A kind of black one-faced tapes and preparation method thereof with heat insulating function - Google Patents

A kind of black one-faced tapes and preparation method thereof with heat insulating function Download PDF

Info

Publication number
CN109825205A
CN109825205A CN201910040220.XA CN201910040220A CN109825205A CN 109825205 A CN109825205 A CN 109825205A CN 201910040220 A CN201910040220 A CN 201910040220A CN 109825205 A CN109825205 A CN 109825205A
Authority
CN
China
Prior art keywords
heat
black
insulated
acrylic acid
acrylic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910040220.XA
Other languages
Chinese (zh)
Inventor
陈鑫
柏金明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou World Electronic Technology Co Ltd
Original Assignee
Suzhou World Electronic Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou World Electronic Technology Co Ltd filed Critical Suzhou World Electronic Technology Co Ltd
Priority to CN201910040220.XA priority Critical patent/CN109825205A/en
Publication of CN109825205A publication Critical patent/CN109825205A/en
Pending legal-status Critical Current

Links

Landscapes

  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

A kind of black one-faced tapes with heat insulating function the invention discloses adiabatic gum with technical field, including the release layer successively contacted, heat-insulated acrylic acid glue-line, heat-insulated PET base membrane layer and insulating moulding coating layer, the release layer with a thickness of 23~75 microns, and release layer is preferably PET release film, the heat-insulated acrylic acid glue-line with a thickness of 5~15 microns, the heat-insulated acrylic acid glue-line includes rutile titanium dioxide, one of eakleite and hollow glass micropearl are a variety of, the insulating moulding coating layer includes acrylic emulsion 35-50wt%, rutile type titanium white 10-25wt%, sericite 1-8wt%, heat-reflecting heat-insulating powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, auxiliary agent 2-20wt%, it is described Heat-insulated PET basement membrane with a thickness of 1.9~30 microns, the invention enables black one-faced tapes have preferable heat insulating function, can effectively improve heat-proof quality, stability, dispersion performance and the reflecting properties of adhesive tape entirety, strengthen the whole service performance of adhesive tape.

Description

A kind of black one-faced tapes and preparation method thereof with heat insulating function
Technical field
The present invention relates to adiabatic gum band technical field, specially a kind of black one-faced tapes and its system with heat insulating function Preparation Method.
Background technique
In daily use process, black belt is easy to absorb light during use existing black one-faced tapes Heat, and the appliance and electronic fastened by black belt is easy directly to conduct by adhesive tape to the outside of casing in adstante febre, it is existing Some black one-faced tapes do not have excellent heat-proof quality, in order to reinforce the whole service performance of adhesive tape.For this purpose, it is proposed that A kind of black one-faced tapes and preparation method thereof with heat insulating function.
Summary of the invention
The purpose of the present invention is to provide a kind of black one-faced tapes and preparation method thereof with heat insulating function, to solve The problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme: a kind of black one-faced tapes with heat insulating function, Including release layer, heat-insulated acrylic acid glue-line, heat-insulated PET base membrane layer and the insulating moulding coating layer successively contacted.
Further, the release layer with a thickness of 23~75 microns, and release layer is preferably PET release film.
Further, the heat-insulated acrylic acid glue-line with a thickness of 5~15 microns, the heat-insulated acrylic acid glue-line include gold One of red stone-type titanium dioxide, eakleite and hollow glass micropearl are a variety of.
Further, the insulating moulding coating layer includes acrylic emulsion 35-50wt%, rutile type titanium white 10- 25wt%, sericite 1-8wt%, heat-reflecting heat-insulating powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, Auxiliary agent 2-20wt%.
Further, the heat-insulated PET basement membrane with a thickness of 1.9~30 microns.
Further, a kind of preparation method of the black one-faced tapes with heat insulating function:
1) the carbon black black color paste 6% that polyurethane resin 89% and solid content are 20% is stirred at 1000rpm 20min is added epoxide resin type curing additive 1%, 20min is stirred at 1000rpm, with two layers of 400 mesh metal filter screens Filtering, obtaining black non-sticky can print printing ink paint, by acrylic acid adhesive 76%, the carbon black black color that solid content is 20% Slurry 6%, ethyl acetate 14% and hexamethylene diisocyanate 4% mix, and the heat-insulated acrylic acid sizing material of black are obtained, then black Color acrylic acid sizing material adds heat insulating function auxiliary agent, and 2~7 parts of heat insulating function selection of auxiliary of rutile titanium dioxide, hard silicon One of calcium stone and hollow glass micropearl are a variety of, to obtain the heat-insulated acrylic acid glue-line of black;
2) by acrylic emulsion 35-50wt%, rutile type titanium white 10-25wt%, sericite 1-8wt%, heat reflection Heat-insulating powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, auxiliary agent 2-20wt% be mixed from And prepare insulating moulding coating layer;
3) acrylic acid ester emulsion of phosphate ester-containing group is used, and the acrylic acid ester emulsion of phosphate ester-containing group passes through first Acrylic monomers is obtained with the second acrylic monomers emulsion polymerization;Wherein the first acrylic monomers is phosphoester acrylic ester, the Diacrylate monomer is selected from acrylic acid, butyl methacrylate, methyl methacrylate, butyl acrylate, acrylic acid-2-ethyl One of own ester is a variety of.
4) one side of heat-insulated PET basement membrane is coated into the heat-insulated acrylic acid sizing material of black, solidification forms heat-insulated acrylic acid glue-line; In the another side coating thermal insulating of heat-insulated PET basement membrane, solidification forms insulating moulding coating layer, then on heat-insulated acrylic acid glue-line Release layer is covered, black one-faced tapes are obtained.
Compared with prior art, the beneficial effects of the present invention are: the present invention passes through heat-insulated acrylic acid glue-line, heat-insulated PET base The setting of film layer and insulating moulding coating layer so that black one-faced tapes have preferable heat insulating function, while preparing heat-insulated painting When the bed of material, heat-proof quality, the stability of adhesive tape entirety can be effectively improved using the acrylic acid ester emulsion of phosphate ester-containing group Energy, dispersion performance and reflecting properties, strengthen the whole service performance of adhesive tape.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention.
In figure: 1 release layer, 2 heat-insulated acrylic acid glue-lines, 3 heat-insulated PET base membrane layers, 4 insulating moulding coating layers.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of black one-faced tapes with heat insulating function, including Release layer 1, heat-insulated acrylic acid glue-line 2, heat-insulated PET base membrane layer 3 and the insulating moulding coating layer 4 successively contacted.
As shown in Figure 1, release layer 1 with a thickness of 23~75 microns, and release layer 1 be preferably PET release film;
As shown in Figure 1, heat-insulated acrylic acid glue-line 2 with a thickness of 5~15 microns, heat-insulated acrylic acid glue-line 2 include rutile One of type titanium dioxide, eakleite and hollow glass micropearl are a variety of;
As shown in Figure 1, insulating moulding coating layer 4 includes acrylic emulsion 35-50wt%, rutile type titanium white 10-25wt%, Sericite 1-8wt%, heat-reflecting heat-insulating powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, auxiliary agent 2- 20wt%;
As shown in Figure 1, using the acrylic acid ester emulsion of phosphate ester-containing group, and the acrylic acid ester emulsion of phosphate ester-containing group It is obtained by the first acrylic monomers and the second acrylic monomers emulsion polymerization;Wherein the first acrylic monomers is phosphate propylene Acid esters, the second acrylic monomers are selected from acrylic acid, butyl methacrylate, methyl methacrylate, butyl acrylate, propylene One of acid -2- ethylhexyl is a variety of;
As shown in Figure 1, heat-insulated PET basement membrane 3 with a thickness of 1.9~30 microns.
A kind of preparation method of the black one-faced tapes with heat insulating function:
1) the carbon black black color paste 6% that polyurethane resin 89% and solid content are 20% is stirred at 1000rpm 20min is added epoxide resin type curing additive 1%, 20min is stirred at 1000rpm, with two layers of 400 mesh metal filter screens Filtering, obtaining black non-sticky can print printing ink paint, by acrylic acid adhesive 76%, the carbon black black color that solid content is 20% Slurry 6%, ethyl acetate 14% and hexamethylene diisocyanate 4% mix, and the heat-insulated acrylic acid sizing material of black are obtained, then black Color acrylic acid sizing material adds heat insulating function auxiliary agent, and 2~7 parts of heat insulating function selection of auxiliary of rutile titanium dioxide, hard silicon One of calcium stone and hollow glass micropearl are a variety of, to obtain the heat-insulated acrylic acid glue-line 2 of black;
2) by acrylic emulsion 35-50wt%, rutile type titanium white 10-25wt%, sericite 1-8wt%, heat reflection Heat-insulating powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, auxiliary agent 2-20wt% be mixed from And prepare insulating moulding coating layer 4;
3) one side of heat-insulated PET basement membrane 3 is coated into the heat-insulated acrylic acid sizing material of black, solidification forms heat-insulated acrylic acid glue-line 2;In the another side coating thermal insulating of heat-insulated PET basement membrane 3, solidification forms insulating moulding coating layer 4, then in heat-insulated acrylate glue Release layer 1 is covered on layer 2, obtains black one-faced tapes.
Embodiment 1: 3 parts by weight Emulsifier (SDBS and OP-10 mass ratio is 2:1), 20 parts by weight of deionized water are added In there-necked flask, pre-emulsification 15min.Then 7 the first acrylic monomers of parts by weight and 45 weight are added dropwise into reaction flask while stirring The second acrylic monomers of part (20 parts by weight of butyl methacrylate, 5 parts by weight of methyl methacrylate, 2 parts by weight of acrylic acid, 15 parts by weight of butyl acrylate, 3 parts by weight of acrylic acid-2-ethyl caproite), 0.4 parts by weight initiator KPS, 3 parts by weight buffers NaHCO3 and 20 parts by weight of deionized water.Rear high-speed stirred 1h is dripped, monomer pre-emulsion is obtained, it is spare.Take the pre- cream of monomer Change liquid 1/3 is added in the four-hole bottle equipped with reflux condenser, blender and constant pressure funnel, and stirring is warming up to 82 DEG C. Start that remaining 2/3 monomer pre-emulsion is slowly added dropwise when obvious blue light occurs in system, temperature control is added dropwise in 83 DEG C, 2h It finishes.40 DEG C or so are cooled to after heat preservation 2h, 1.6 parts by weight neutralizer ammonium hydroxide are added, regulation system pH value is 8, filtering and discharging, Obtain the acrylic emulsion for the phosphate ester-containing group that solid content is 42-48%, the acrylate glue for being 88:7:5 according to quality proportioning Glutinous agent, rutile titanium dioxide and hexamethylene diisocyanate curing agent mix in the acrylic emulsion of phosphate ester-containing group It closes, stirs 20min, obtain heat-insulated acrylic acid sizing material.
Embodiment 2: 3 parts by weight Emulsifier (SDBS and OP-10 mass ratio is 2:1), 20 parts by weight of deionized water are added In there-necked flask, pre-emulsification 20min.Then 10 the first acrylic monomers of parts by weight and 42 weight are added dropwise into reaction flask while stirring The second acrylic monomers of part (20 parts by weight of butyl methacrylate, 2 parts by weight of methyl methacrylate, 2 parts by weight of acrylic acid, 15 parts by weight of butyl acrylate, 3 parts by weight of acrylic acid-2-ethyl caproite), 0.4 parts by weight initiator KPS, 3 parts by weight buffers NaHCO3 and 20 parts by weight of deionized water.Rear high-speed stirred 1h is dripped, monomer pre-emulsion is obtained, it is spare.Take the pre- cream of monomer Change liquid 1/3 is added in the four-hole bottle equipped with reflux condenser, blender and constant pressure funnel, and stirring is warming up to 82 DEG C. Start that remaining 2/3 monomer pre-emulsion is slowly added dropwise when obvious blue light occurs in system, temperature control is added dropwise in 84 DEG C, 3h It finishes.40 DEG C or so are cooled to after heat preservation 2h, 1.6 parts by weight neutralizer ammonium hydroxide are added, regulation system pH value is 8, filtering and discharging, Obtain the acrylic emulsion for the phosphate ester-containing group that solid content is 42-48%, the acrylate glue for being 85:4:2 according to quality proportioning Glutinous agent, rutile titanium dioxide and hexamethylene diisocyanate curing agent mix in the acrylic emulsion of phosphate ester-containing group It closes, stirs 20min, obtain heat-insulated acrylic acid sizing material.
Embodiment 3: according to following proportion carry out ingredient: HD-3268 polyurethane resin, styrene-maleic anhydride copolymer, Distearyl acid ethylenediamine, propandiol butyl ether, toluene di-isocyanate(TDI) and rutile titanium dioxide mass ratio be 89:2:3:1: Model HD-3268 polyurethane resin and styrene-maleic anhydride copolymer are stirred 20min at 1000rpm, added by 3:2 Distearyl acid ethylenediamine stirs 10min, stirs 10min after propandiol butyl ether and toluene di-isocyanate(TDI) is added, is eventually adding gold Red stone-type titanium dioxide stirs 20min, obtains insulating moulding coating.
Embodiment 4: polyurethane resin, polycarboxylate sodium, the 2-Ethylhexyl Alcohol, propylene glycol fourth for the A-601 that refines model big day The mass ratio of ether, hexamethylene diisocyanate and eakleite is 91:2:2:1:1:3, by the A-601 that refines above-mentioned model big day Polyurethane resin and polycarboxylate sodium stir 20min at 1000rpm, add 2-Ethylhexyl Alcohol stirring 10min, be added two Stir 10min after propylene glycol monomethyl ether and hexamethylene diisocyanate, be eventually adding eakleite stirring 20min, obtain every Hot coating.
Table 1
Performance ratio Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4
Heat-proof quality It is excellent It is excellent It is good It is good
Dispersion performance It is excellent It is excellent It is excellent It is good
Stability It is excellent It is excellent It is good It is excellent
Reflecting properties It is excellent It is excellent It is good It is good
To sum up by the setting of heat-insulated acrylic acid glue-line, heat-insulated PET base membrane layer and insulating moulding coating layer described in table 1, so that black Color one-faced tapes have preferable heat insulating function, while when preparing insulating moulding coating layer, using the propylene of phosphate ester-containing group Acid esters lotion can effectively improve heat-proof quality, stability, dispersion performance and the reflecting properties of adhesive tape entirety.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (6)

1. a kind of black one-faced tapes with heat insulating function, including release layer (1), the heat-insulated acrylic acid glue-line successively contacted (2), heat-insulated PET base membrane layer (3) and insulating moulding coating layer (4).
2. a kind of black one-faced tapes with heat insulating function according to claim 1, it is characterised in that: the release layer (1) with a thickness of 23~75 microns, and release layer (1) is preferably PET release film.
3. a kind of black one-faced tapes with heat insulating function according to claim 1, it is characterised in that: described heat-insulated third Olefin(e) acid glue-line (2) with a thickness of 5~15 microns, the heat-insulated acrylic acid glue-line (2) includes rutile titanium dioxide, hard silico-calcium One of stone and hollow glass micropearl are a variety of.
4. a kind of black one-faced tapes with heat insulating function according to claim 1, it is characterised in that: the heat-insulated painting The bed of material (4) includes acrylic emulsion 35-50wt%, rutile type titanium white 10-25wt%, sericite 1-8wt%, heat reflection every Hot powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, auxiliary agent 2-20wt%.
5. a kind of black one-faced tapes with heat insulating function according to claim 1, it is characterised in that: described heat-insulated PET basement membrane (3) with a thickness of 1.9~30 microns.
6. a kind of preparation method of the black one-faced tapes with heat insulating function, it is characterised in that:
1) the carbon black black color paste 6% that polyurethane resin 89% and solid content are 20% is stirred into 20min at 1000rpm, added Enter epoxide resin type curing additive 1%, stir 20min at 1000rpm, with two layers of 400 mesh metal filtration net filtrations, obtains Black non-sticky can print printing ink paint, by acrylic acid adhesive 76%, the carbon black black color paste 6% that solid content is 20%, second Acetoacetic ester 14% and hexamethylene diisocyanate 4% mix, and the heat-insulated acrylic acid sizing material of black are obtained, then in black acrylic Sizing material adds heat insulating function auxiliary agent, and 2~7 parts of heat insulating function selection of auxiliary of rutile titanium dioxide, eakleite and sky One of heart glass microballoon is a variety of, to obtain the heat-insulated acrylic acid glue-line (2) of black;
2) by acrylic emulsion 35-50wt%, rutile type titanium white 10-25wt%, sericite 1-8wt%, heat-reflecting heat-insulating Powder 2.5-15wt%, hollow glass micropearl 5-20wt%, water 10-15wt%, auxiliary agent 2-20wt% be mixed making Standby insulating moulding coating layer (4);
3) acrylic acid ester emulsion of phosphate ester-containing group is used, and the acrylic acid ester emulsion of phosphate ester-containing group passes through the first propylene Acid monomers are obtained with the second acrylic monomers emulsion polymerization;Wherein the first acrylic monomers is phosphoester acrylic ester, the two the third Acrylic monomer is selected from acrylic acid, butyl methacrylate, methyl methacrylate, butyl acrylate, acrylic acid-2-ethyl caproite One of or it is a variety of;
4) one side of heat-insulated PET basement membrane (3) is coated into the heat-insulated acrylic acid sizing material of black, solidification forms heat-insulated acrylic acid glue-line (2);In the another side coating thermal insulating of heat-insulated PET basement membrane (3), solidification is formed insulating moulding coating layer (4), then heat-insulated third Release layer (1) is covered on olefin(e) acid glue-line (2), obtains black one-faced tapes.
CN201910040220.XA 2019-01-16 2019-01-16 A kind of black one-faced tapes and preparation method thereof with heat insulating function Pending CN109825205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910040220.XA CN109825205A (en) 2019-01-16 2019-01-16 A kind of black one-faced tapes and preparation method thereof with heat insulating function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910040220.XA CN109825205A (en) 2019-01-16 2019-01-16 A kind of black one-faced tapes and preparation method thereof with heat insulating function

Publications (1)

Publication Number Publication Date
CN109825205A true CN109825205A (en) 2019-05-31

Family

ID=66860304

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910040220.XA Pending CN109825205A (en) 2019-01-16 2019-01-16 A kind of black one-faced tapes and preparation method thereof with heat insulating function

Country Status (1)

Country Link
CN (1) CN109825205A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112374259A (en) * 2020-10-28 2021-02-19 南京尚达电子绝缘材料有限公司 Black single-sided adhesive tape with heat insulation function and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103073963A (en) * 2011-10-26 2013-05-01 比亚迪股份有限公司 Flame-retardant reflection insulation paint and preparation method thereof
CN206591069U (en) * 2017-02-27 2017-10-27 东莞市吉晨胶粘制品有限公司 A kind of ultra-thin black PET two-sided tapes
CN108424729A (en) * 2018-05-11 2018-08-21 东莞市古川胶带有限公司 A kind of black one-faced tapes and preparation method thereof with heat insulating function

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103073963A (en) * 2011-10-26 2013-05-01 比亚迪股份有限公司 Flame-retardant reflection insulation paint and preparation method thereof
CN206591069U (en) * 2017-02-27 2017-10-27 东莞市吉晨胶粘制品有限公司 A kind of ultra-thin black PET two-sided tapes
CN108424729A (en) * 2018-05-11 2018-08-21 东莞市古川胶带有限公司 A kind of black one-faced tapes and preparation method thereof with heat insulating function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112374259A (en) * 2020-10-28 2021-02-19 南京尚达电子绝缘材料有限公司 Black single-sided adhesive tape with heat insulation function and preparation method thereof

Similar Documents

Publication Publication Date Title
CN101168584B (en) Redispersable latex powder emulsion, redispersable latex powder and preparation method thereof
CN102718916B (en) Alcohol-water-soluble vinyl versatate modified vinegar C system acrylic resin and preparation method thereof
CN100480288C (en) Alcoholic soluble resin and preparation method thereof
CN101899278A (en) Double-component dry composite adhesive and method for preparing same
CN104817878A (en) Ultraviolet curing anti-sandblasting shielding protection printing ink
CN105463882A (en) Gold print paste and preparation method thereof
CN109651961A (en) A kind of acrylate pressure sensitive adhesive, photo-thermal dual curable glue film and preparation method thereof
CN110423593A (en) A kind of full joint adhesive of high sensitivity protecting screen of mobile phone and preparation method thereof
CN106349450B (en) Combined polyether, polyurethane adhesive and feedstock composition, preparation method and application
CN108892750B (en) Core-shell polysilsesquioxane/hydroxyl acrylate composite emulsion and preparation method thereof
CN109825205A (en) A kind of black one-faced tapes and preparation method thereof with heat insulating function
CN104152084A (en) High temperature-resistant low viscosity pressure-sensitive adhesive used for protection films, and preparation method and application thereof
CN110511641A (en) A kind of BOPA pre-coating film and preparation method thereof enhancing UV ink adhesion
CN102516864A (en) Composite aqueous UV coating
CN105949396B (en) A kind of water based silicone resin and preparation method thereof
CN101736608A (en) Pigment printing thickener and method for preparing same
CN108641639A (en) The preparation method of isocyanate-water polymer complex emulsions based Wood Adhesives
CN112679683B (en) Functionalized graphene oxide modified core-shell structure acrylate emulsion and preparation method thereof
CN108250834A (en) A kind of environment-friendly water-based printing ink and its manufacturing method
CN103724521A (en) Preparation method of single-component polyacrylate pressure-sensitive adhesive for optical protective film
CN100572406C (en) A kind of hydrophobicity redispersable latex powder
CN107083143B (en) Baking-type aqueous organosilicon fluoropolymer coating, and method for forming same
CN104031228B (en) A kind of benzene-free ketone-free modified acrylic ester resin and preparation method thereof
CN106675374A (en) Environment-friendly water-based photo-curing UV coating as well as preparation method and application thereof
CN110016143A (en) A kind of polyfunctionality mixes solidified resin and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20190531